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GitHub - speed47/spectre-meltdown-checker: Reptar, Downfall, Zenbleed, ZombieLoad, RIDL, Fallout, Foreshadow, Spectre, Meltdown vulnerability/mitigation checker for Linux & BSD
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2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 pb-lg-3 mb-3 mb-lg-0"> <span class="d-block h4 color-fg-default my-1" id="solutions-by-company-size-heading">By company size</span> <ul class="list-style-none f5" aria-labelledby="solutions-by-company-size-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"enterprises","context":"solutions","tag":"link","label":"enterprises_link_solutions_navbar"}" href="https://github.com/enterprise"> Enterprises </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"small_and_medium_teams","context":"solutions","tag":"link","label":"small_and_medium_teams_link_solutions_navbar"}" href="https://github.com/team"> Small and medium teams </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"startups","context":"solutions","tag":"link","label":"startups_link_solutions_navbar"}" href="https://github.com/enterprise/startups"> Startups </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"nonprofits","context":"solutions","tag":"link","label":"nonprofits_link_solutions_navbar"}" href="/solutions/industry/nonprofits"> Nonprofits 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data-analytics-event="{"location":"navbar","action":"ci_cd","context":"solutions","tag":"link","label":"ci_cd_link_solutions_navbar"}" href="/solutions/use-case/ci-cd"> CI/CD </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_use_cases","context":"solutions","tag":"link","label":"view_all_use_cases_link_solutions_navbar"}" href="/solutions/use-case"> View all use cases </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="solutions-by-industry-heading">By industry</span> <ul class="list-style-none f5" aria-labelledby="solutions-by-industry-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul class="list-style-none f5" aria-labelledby="resources-topics-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"ai","context":"resources","tag":"link","label":"ai_link_resources_navbar"}" href="/resources/articles/ai"> AI </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"devops","context":"resources","tag":"link","label":"devops_link_resources_navbar"}" href="/resources/articles/devops"> DevOps </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 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1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"events_amp_webinars","context":"resources","tag":"link","label":"events_amp_webinars_link_resources_navbar"}" href="https://resources.github.com"> Events & Webinars <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"ebooks_amp_whitepapers","context":"resources","tag":"link","label":"ebooks_amp_whitepapers_link_resources_navbar"}" href="https://github.com/resources/whitepapers"> Ebooks & Whitepapers </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"customer_stories","context":"resources","tag":"link","label":"customer_stories_link_resources_navbar"}" href="https://github.com/customer-stories"> Customer Stories </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"partners","context":"resources","tag":"link","label":"partners_link_resources_navbar"}" href="https://partner.github.com"> Partners <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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class=\"heading-element\" dir=\"auto\"\u003eSpectre \u0026amp; Meltdown Checker\u003c/h1\u003e\u003ca id=\"user-content-spectre--meltdown-checker\" class=\"anchor\" aria-label=\"Permalink: Spectre \u0026amp; Meltdown Checker\" href=\"#spectre--meltdown-checker\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA shell script to assess your system's resilience against the several \u003ca href=\"https://en.wikipedia.org/wiki/Transient_execution_CPU_vulnerability\" rel=\"nofollow\"\u003etransient execution\u003c/a\u003e CVEs that were published since early 2018, and give you guidance as to how to mitigate them.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCVE\u003c/th\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eAliases\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754\" rel=\"nofollow\"\u003eCVE-2017-5753\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eBounds Check Bypass\u003c/td\u003e\n\u003ctd\u003eSpectre Variant 1\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715\" rel=\"nofollow\"\u003eCVE-2017-5715\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eBranch Target Injection\u003c/td\u003e\n\u003ctd\u003eSpectre Variant 2\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754\" rel=\"nofollow\"\u003eCVE-2017-5754\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eRogue Data Cache Load\u003c/td\u003e\n\u003ctd\u003eMeltdown, Variant 3\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3640\" rel=\"nofollow\"\u003eCVE-2018-3640\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eRogue System Register Read\u003c/td\u003e\n\u003ctd\u003eVariant 3a\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639\" rel=\"nofollow\"\u003eCVE-2018-3639\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eSpeculative Store Bypass\u003c/td\u003e\n\u003ctd\u003eVariant 4\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3615\" rel=\"nofollow\"\u003eCVE-2018-3615\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eL1 Terminal Fault\u003c/td\u003e\n\u003ctd\u003eL1TF, Foreshadow (SGX)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3620\" rel=\"nofollow\"\u003eCVE-2018-3620\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eL1 Terminal Fault\u003c/td\u003e\n\u003ctd\u003eL1TF, Foreshadow-NG (OS)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3646\" rel=\"nofollow\"\u003eCVE-2018-3646\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eL1 Terminal Fault\u003c/td\u003e\n\u003ctd\u003eL1TF, Foreshadow-NG (VMM)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12126\" rel=\"nofollow\"\u003eCVE-2018-12126\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eMicroarchitectural Store Buffer Data Sampling\u003c/td\u003e\n\u003ctd\u003eMSBDS, Fallout\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12130\" rel=\"nofollow\"\u003eCVE-2018-12130\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eMicroarchitectural Fill Buffer Data Sampling\u003c/td\u003e\n\u003ctd\u003eMFBDS, ZombieLoad\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12127\" rel=\"nofollow\"\u003eCVE-2018-12127\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eMicroarchitectural Load Port Data Sampling\u003c/td\u003e\n\u003ctd\u003eMLPDS, RIDL\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11091\" rel=\"nofollow\"\u003eCVE-2019-11091\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eMicroarchitectural Data Sampling Uncacheable Memory\u003c/td\u003e\n\u003ctd\u003eMDSUM, RIDL\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135\" rel=\"nofollow\"\u003eCVE-2019-11135\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eTSX asynchronous abort\u003c/td\u003e\n\u003ctd\u003eTAA, ZombieLoad V2\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207\" rel=\"nofollow\"\u003eCVE-2018-12207\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eMachine Check Exception on Page Size Changes\u003c/td\u003e\n\u003ctd\u003eMCEPSC, No eXcuses, iTLB Multihit\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543\" rel=\"nofollow\"\u003eCVE-2020-0543\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eSpecial Register Buffer Data Sampling\u003c/td\u003e\n\u003ctd\u003eSRBDS\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40982\" rel=\"nofollow\"\u003eCVE-2022-40982\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eGather Data Sampling\u003c/td\u003e\n\u003ctd\u003eGDS, Downfall\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20569\" rel=\"nofollow\"\u003eCVE-2023-20569\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eReturn Address Security\u003c/td\u003e\n\u003ctd\u003eInception, RAS, SRSO\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20593\" rel=\"nofollow\"\u003eCVE-2023-20593\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eCross-Process Information Leak\u003c/td\u003e\n\u003ctd\u003eZenbleed\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23583\" rel=\"nofollow\"\u003eCVE-2023-23583\u003c/a\u003e\u003c/td\u003e\n\u003ctd\u003eRedundant Prefix issue\u003c/td\u003e\n\u003ctd\u003eReptar\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eSupported operating systems:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eLinux (all versions, flavors and distros)\u003c/li\u003e\n\u003cli\u003eFreeBSD, NetBSD, DragonFlyBSD and derivatives (others BSDs are \u003ca href=\"/speed47/spectre-meltdown-checker/blob/master/FAQ.md#which-bsd-oses-are-supported\"\u003enot supported\u003c/a\u003e)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eFor Linux systems, the tool will detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number and the distribution (such as Debian, Ubuntu, CentOS, RHEL, Fedora, openSUSE, Arch, ...), it also works if you've compiled your own kernel. More information \u003ca href=\"/speed47/spectre-meltdown-checker/blob/master/FAQ.md#how-does-this-script-work\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther operating systems such as MacOS, Windows, ESXi, etc. \u003ca href=\"/speed47/spectre-meltdown-checker/blob/master/FAQ.md#why-is-my-os-not-supported\"\u003ewill most likely never be supported\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSupported architectures:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ex86\u003c/code\u003e (32 bits)\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eamd64\u003c/code\u003e/\u003ccode\u003ex86_64\u003c/code\u003e (64 bits)\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eARM\u003c/code\u003e and \u003ccode\u003eARM64\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eother architectures will work, but mitigations (if they exist) might not always be detected\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrequently Asked Questions (FAQ)\u003c/h2\u003e\u003ca id=\"user-content-frequently-asked-questions-faq\" class=\"anchor\" aria-label=\"Permalink: Frequently Asked Questions (FAQ)\" href=\"#frequently-asked-questions-faq\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWhat is the purpose of this tool?\u003c/li\u003e\n\u003cli\u003eWhy was it written?\u003c/li\u003e\n\u003cli\u003eHow can it be useful to me?\u003c/li\u003e\n\u003cli\u003eHow does it work?\u003c/li\u003e\n\u003cli\u003eWhat can I expect from it?\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eAll these questions (and more) have detailed answers in the \u003ca href=\"/speed47/spectre-meltdown-checker/blob/master/FAQ.md\"\u003eFAQ\u003c/a\u003e, please have a look!\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEasy way to run the script\u003c/h2\u003e\u003ca id=\"user-content-easy-way-to-run-the-script\" class=\"anchor\" aria-label=\"Permalink: Easy way to run the script\" href=\"#easy-way-to-run-the-script\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eGet the latest version of the script using \u003ccode\u003ecurl\u003c/code\u003e \u003cem\u003eor\u003c/em\u003e \u003ccode\u003ewget\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh\nwget https://meltdown.ovh -O spectre-meltdown-checker.sh\"\u003e\u003cpre\u003ecurl -L https://meltdown.ovh -o spectre-meltdown-checker.sh\nwget https://meltdown.ovh -O spectre-meltdown-checker.sh\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eInspect the script. You never blindly run scripts you downloaded from the Internet, do you?\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"vim spectre-meltdown-checker.sh\"\u003e\u003cpre\u003evim spectre-meltdown-checker.sh\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWhen you're ready, run the script as root\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"chmod +x spectre-meltdown-checker.sh\nsudo ./spectre-meltdown-checker.sh\"\u003e\u003cpre\u003echmod +x spectre-meltdown-checker.sh\nsudo ./spectre-meltdown-checker.sh\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRun the script in a docker container\u003c/h3\u003e\u003ca id=\"user-content-run-the-script-in-a-docker-container\" class=\"anchor\" aria-label=\"Permalink: Run the script in a docker container\" href=\"#run-the-script-in-a-docker-container\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWith docker-compose\u003c/h4\u003e\u003ca id=\"user-content-with-docker-compose\" class=\"anchor\" aria-label=\"Permalink: With docker-compose\" href=\"#with-docker-compose\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"docker compose build\ndocker compose run --rm spectre-meltdown-checker\"\u003e\u003cpre\u003edocker compose build\ndocker compose run --rm spectre-meltdown-checker\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that on older versions of docker, \u003ccode\u003edocker-compose\u003c/code\u003e is a separate command, so you might\nneed to replace the two \u003ccode\u003edocker compose\u003c/code\u003e occurences above by \u003ccode\u003edocker-compose\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWithout docker-compose\u003c/h4\u003e\u003ca id=\"user-content-without-docker-compose\" class=\"anchor\" aria-label=\"Permalink: Without docker-compose\" href=\"#without-docker-compose\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"docker build -t spectre-meltdown-checker .\ndocker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker\"\u003e\u003cpre\u003edocker build -t spectre-meltdown-checker \u003cspan class=\"pl-c1\"\u003e.\u003c/span\u003e\ndocker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample of script output\u003c/h2\u003e\u003ca id=\"user-content-example-of-script-output\" class=\"anchor\" aria-label=\"Permalink: Example of script output\" href=\"#example-of-script-output\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIntel Haswell CPU running under Ubuntu 16.04 LTS\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://user-images.githubusercontent.com/218502/108764885-6dcfc380-7553-11eb-81ac-4d19060a3acf.png\"\u003e\u003cimg src=\"https://user-images.githubusercontent.com/218502/108764885-6dcfc380-7553-11eb-81ac-4d19060a3acf.png\" alt=\"haswell\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAMD Ryzen running under OpenSUSE Tumbleweed\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://user-images.githubusercontent.com/218502/108764896-70321d80-7553-11eb-9dd2-fad2a0a1a737.png\"\u003e\u003cimg src=\"https://user-images.githubusercontent.com/218502/108764896-70321d80-7553-11eb-9dd2-fad2a0a1a737.png\" alt=\"ryzen\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eBatch mode (JSON flavor)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://user-images.githubusercontent.com/218502/108764902-71634a80-7553-11eb-9678-fd304995fa64.png\"\u003e\u003cimg src=\"https://user-images.githubusercontent.com/218502/108764902-71634a80-7553-11eb-9678-fd304995fa64.png\" alt=\"batch\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQuick summary of the CVEs\u003c/h2\u003e\u003ca id=\"user-content-quick-summary-of-the-cves\" class=\"anchor\" aria-label=\"Permalink: Quick summary of the CVEs\" href=\"#quick-summary-of-the-cves\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2017-5753\u003c/strong\u003e bounds check bypass (Spectre Variant 1)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; all software\u003c/li\u003e\n\u003cli\u003eMitigation: recompile software \u003cem\u003eand\u003c/em\u003e kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: negligible\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2017-5715\u003c/strong\u003e branch target injection (Spectre Variant 2)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel\u003c/li\u003e\n\u003cli\u003eMitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors)\u003c/li\u003e\n\u003cli\u003eMitigation 2: introducing \"retpoline\" into compilers, and recompile software/OS with it\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2017-5754\u003c/strong\u003e rogue data cache load (Meltdown)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel\u003c/li\u003e\n\u003cli\u003eMitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to medium\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-3640\u003c/strong\u003e rogue system register read (Variant 3a)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: TBC\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update only\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: negligible\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-3639\u003c/strong\u003e speculative store bypass (Variant 4)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: software using JIT (no known exploitation against kernel)\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update + kernel update making possible for affected software to protect itself\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to medium\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-3615\u003c/strong\u003e l1 terminal fault (Foreshadow-NG SGX)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; all software (any physical memory address in the system)\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: negligible\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-3620\u003c/strong\u003e l1 terminal fault (Foreshadow-NG SMM)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; System management mode\u003c/li\u003e\n\u003cli\u003eMitigation: updated kernel (with PTE inversion)\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: negligible\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-3646\u003c/strong\u003e l1 terminal fault (Foreshadow-NG VMM)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Virtualization software and Virtual Machine Monitors\u003c/li\u003e\n\u003cli\u003eMitigation: disable ept (extended page tables), disable hyper-threading (SMT), or updated kernel (with L1d flush)\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to significant\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-12126\u003c/strong\u003e [MSBDS] Microarchitectural Store Buffer Data Sampling (Fallout)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-12130\u003c/strong\u003e [MFBDS] Microarchitectural Fill Buffer Data Sampling (ZombieLoad)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-12127\u003c/strong\u003e [MLPDS] Microarchitectural Load Port Data Sampling (RIDL)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2019-11091\u003c/strong\u003e [MDSUM] Microarchitectural Data Sampling Uncacheable Memory (RIDL)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eNote: These 4 CVEs are similar and collectively named \"MDS\" vulnerabilities, the mitigation is identical for all\u003c/li\u003e\n\u003cli\u003eImpact: Kernel\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to significant\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2019-11135\u003c/strong\u003e TSX Asynchronous Abort (TAA, ZombieLoad V2)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to significant\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2018-12207\u003c/strong\u003e machine check exception on page size changes (No eXcuses, iTLB Multihit)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Virtualization software and Virtual Machine Monitors\u003c/li\u003e\n\u003cli\u003eMitigation: disable hugepages use in hypervisor, or update hypervisor to benefit from mitigation\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to significant\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2020-0543\u003c/strong\u003e Special Register Buffer Data Sampling (SRBDS)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update + kernel update helping to protect various CPU internal buffers from unprivileged speculative access to data\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2022-40982\u003c/strong\u003e Gather Data Sampling (GDS, Downfall)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; all software\u003c/li\u003e\n\u003cli\u003eMitigation: either microcode update or disabling AVX feature\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: TBD\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2023-20569\u003c/strong\u003e Return Address Security (Inception)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; all software\u003c/li\u003e\n\u003cli\u003eMitigation: updated kernel \u0026amp; microcode\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low to significant depending on the mitigation\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2023-20593\u003c/strong\u003e Cross-Process Information Leak (Zenbleed)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: Kernel \u0026amp; all software\u003c/li\u003e\n\u003cli\u003eMitigation: either kernel mitigation by disabling a CPU optimization through an MSR bit, or CPU microcode mitigation\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: TBD\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCVE-2023-23583\u003c/strong\u003e Redundant Prefix issue (Reptar)\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eImpact: All software\u003c/li\u003e\n\u003cli\u003eMitigation: microcode update for the affected CPU\u003c/li\u003e\n\u003cli\u003ePerformance impact of the mitigation: low\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Spectre \u0026 Meltdown Checker","anchor":"spectre--meltdown-checker","htmlText":"Spectre \u0026amp; Meltdown Checker"},{"level":2,"text":"Frequently Asked Questions (FAQ)","anchor":"frequently-asked-questions-faq","htmlText":"Frequently Asked Questions (FAQ)"},{"level":2,"text":"Easy way to run the script","anchor":"easy-way-to-run-the-script","htmlText":"Easy way to run the script"},{"level":3,"text":"Run the script in a docker container","anchor":"run-the-script-in-a-docker-container","htmlText":"Run the script in a docker container"},{"level":4,"text":"With docker-compose","anchor":"with-docker-compose","htmlText":"With docker-compose"},{"level":4,"text":"Without docker-compose","anchor":"without-docker-compose","htmlText":"Without docker-compose"},{"level":2,"text":"Example of script output","anchor":"example-of-script-output","htmlText":"Example of script output"},{"level":2,"text":"Quick summary of the CVEs","anchor":"quick-summary-of-the-cves","htmlText":"Quick summary of the CVEs"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fspeed47%2Fspectre-meltdown-checker"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-96e76d5fdb2c.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"copilot_smell_icebreaker_ux":true,"accessible_code_button":true,"github_models_repo_tab":false}}}}</script> <div data-target="react-partial.reactRoot"><style data-styled="true" data-styled-version="5.3.11">.iVEunk{margin-top:16px;margin-bottom:16px;}/*!sc*/ 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class="heading-element" dir="auto">Spectre & Meltdown Checker</h1><a id="user-content-spectre--meltdown-checker" class="anchor" aria-label="Permalink: Spectre & Meltdown Checker" href="#spectre--meltdown-checker"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A shell script to assess your system's resilience against the several <a href="https://en.wikipedia.org/wiki/Transient_execution_CPU_vulnerability" rel="nofollow">transient execution</a> CVEs that were published since early 2018, and give you guidance as to how to mitigate them.</p> <markdown-accessiblity-table><table> <thead> <tr> <th>CVE</th> <th>Name</th> <th>Aliases</th> </tr> </thead> <tbody> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754" rel="nofollow">CVE-2017-5753</a></td> <td>Bounds Check Bypass</td> <td>Spectre Variant 1</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715" rel="nofollow">CVE-2017-5715</a></td> <td>Branch Target Injection</td> <td>Spectre Variant 2</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754" rel="nofollow">CVE-2017-5754</a></td> <td>Rogue Data Cache Load</td> <td>Meltdown, Variant 3</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3640" rel="nofollow">CVE-2018-3640</a></td> <td>Rogue System Register Read</td> <td>Variant 3a</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639" rel="nofollow">CVE-2018-3639</a></td> <td>Speculative Store Bypass</td> <td>Variant 4</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3615" rel="nofollow">CVE-2018-3615</a></td> <td>L1 Terminal Fault</td> <td>L1TF, Foreshadow (SGX)</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3620" rel="nofollow">CVE-2018-3620</a></td> <td>L1 Terminal Fault</td> <td>L1TF, Foreshadow-NG (OS)</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3646" rel="nofollow">CVE-2018-3646</a></td> <td>L1 Terminal Fault</td> <td>L1TF, Foreshadow-NG (VMM)</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12126" rel="nofollow">CVE-2018-12126</a></td> <td>Microarchitectural Store Buffer Data Sampling</td> <td>MSBDS, Fallout</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12130" rel="nofollow">CVE-2018-12130</a></td> <td>Microarchitectural Fill Buffer Data Sampling</td> <td>MFBDS, ZombieLoad</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12127" rel="nofollow">CVE-2018-12127</a></td> <td>Microarchitectural Load Port Data Sampling</td> <td>MLPDS, RIDL</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11091" rel="nofollow">CVE-2019-11091</a></td> <td>Microarchitectural Data Sampling Uncacheable Memory</td> <td>MDSUM, RIDL</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11135" rel="nofollow">CVE-2019-11135</a></td> <td>TSX asynchronous abort</td> <td>TAA, ZombieLoad V2</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12207" rel="nofollow">CVE-2018-12207</a></td> <td>Machine Check Exception on Page Size Changes</td> <td>MCEPSC, No eXcuses, iTLB Multihit</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0543" rel="nofollow">CVE-2020-0543</a></td> <td>Special Register Buffer Data Sampling</td> <td>SRBDS</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40982" rel="nofollow">CVE-2022-40982</a></td> <td>Gather Data Sampling</td> <td>GDS, Downfall</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20569" rel="nofollow">CVE-2023-20569</a></td> <td>Return Address Security</td> <td>Inception, RAS, SRSO</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20593" rel="nofollow">CVE-2023-20593</a></td> <td>Cross-Process Information Leak</td> <td>Zenbleed</td> </tr> <tr> <td><a href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-23583" rel="nofollow">CVE-2023-23583</a></td> <td>Redundant Prefix issue</td> <td>Reptar</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">Supported operating systems:</p> <ul dir="auto"> <li>Linux (all versions, flavors and distros)</li> <li>FreeBSD, NetBSD, DragonFlyBSD and derivatives (others BSDs are <a href="/speed47/spectre-meltdown-checker/blob/master/FAQ.md#which-bsd-oses-are-supported">not supported</a>)</li> </ul> <p dir="auto">For Linux systems, the tool will detect mitigations, including backported non-vanilla patches, regardless of the advertised kernel version number and the distribution (such as Debian, Ubuntu, CentOS, RHEL, Fedora, openSUSE, Arch, ...), it also works if you've compiled your own kernel. More information <a href="/speed47/spectre-meltdown-checker/blob/master/FAQ.md#how-does-this-script-work">here</a>.</p> <p dir="auto">Other operating systems such as MacOS, Windows, ESXi, etc. <a href="/speed47/spectre-meltdown-checker/blob/master/FAQ.md#why-is-my-os-not-supported">will most likely never be supported</a>.</p> <p dir="auto">Supported architectures:</p> <ul dir="auto"> <li><code>x86</code> (32 bits)</li> <li><code>amd64</code>/<code>x86_64</code> (64 bits)</li> <li><code>ARM</code> and <code>ARM64</code></li> <li>other architectures will work, but mitigations (if they exist) might not always be detected</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Frequently Asked Questions (FAQ)</h2><a id="user-content-frequently-asked-questions-faq" class="anchor" aria-label="Permalink: Frequently Asked Questions (FAQ)" href="#frequently-asked-questions-faq"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>What is the purpose of this tool?</li> <li>Why was it written?</li> <li>How can it be useful to me?</li> <li>How does it work?</li> <li>What can I expect from it?</li> </ul> <p dir="auto">All these questions (and more) have detailed answers in the <a href="/speed47/spectre-meltdown-checker/blob/master/FAQ.md">FAQ</a>, please have a look!</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Easy way to run the script</h2><a id="user-content-easy-way-to-run-the-script" class="anchor" aria-label="Permalink: Easy way to run the script" href="#easy-way-to-run-the-script"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Get the latest version of the script using <code>curl</code> <em>or</em> <code>wget</code></li> </ul> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh wget https://meltdown.ovh -O spectre-meltdown-checker.sh"><pre>curl -L https://meltdown.ovh -o spectre-meltdown-checker.sh wget https://meltdown.ovh -O spectre-meltdown-checker.sh</pre></div> <ul dir="auto"> <li>Inspect the script. You never blindly run scripts you downloaded from the Internet, do you?</li> </ul> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="vim spectre-meltdown-checker.sh"><pre>vim spectre-meltdown-checker.sh</pre></div> <ul dir="auto"> <li>When you're ready, run the script as root</li> </ul> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="chmod +x spectre-meltdown-checker.sh sudo ./spectre-meltdown-checker.sh"><pre>chmod +x spectre-meltdown-checker.sh sudo ./spectre-meltdown-checker.sh</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Run the script in a docker container</h3><a id="user-content-run-the-script-in-a-docker-container" class="anchor" aria-label="Permalink: Run the script in a docker container" href="#run-the-script-in-a-docker-container"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">With docker-compose</h4><a id="user-content-with-docker-compose" class="anchor" aria-label="Permalink: With docker-compose" href="#with-docker-compose"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="docker compose build docker compose run --rm spectre-meltdown-checker"><pre>docker compose build docker compose run --rm spectre-meltdown-checker</pre></div> <p dir="auto">Note that on older versions of docker, <code>docker-compose</code> is a separate command, so you might need to replace the two <code>docker compose</code> occurences above by <code>docker-compose</code>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Without docker-compose</h4><a id="user-content-without-docker-compose" class="anchor" aria-label="Permalink: Without docker-compose" href="#without-docker-compose"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="docker build -t spectre-meltdown-checker . docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker"><pre>docker build -t spectre-meltdown-checker <span class="pl-c1">.</span> docker run --rm --privileged -v /boot:/boot:ro -v /dev/cpu:/dev/cpu:ro -v /lib/modules:/lib/modules:ro spectre-meltdown-checker</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Example of script output</h2><a id="user-content-example-of-script-output" class="anchor" aria-label="Permalink: Example of script output" href="#example-of-script-output"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Intel Haswell CPU running under Ubuntu 16.04 LTS</li> </ul> <p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/218502/108764885-6dcfc380-7553-11eb-81ac-4d19060a3acf.png"><img src="https://user-images.githubusercontent.com/218502/108764885-6dcfc380-7553-11eb-81ac-4d19060a3acf.png" alt="haswell" style="max-width: 100%;"></a></p> <ul dir="auto"> <li>AMD Ryzen running under OpenSUSE Tumbleweed</li> </ul> <p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/218502/108764896-70321d80-7553-11eb-9dd2-fad2a0a1a737.png"><img src="https://user-images.githubusercontent.com/218502/108764896-70321d80-7553-11eb-9dd2-fad2a0a1a737.png" alt="ryzen" style="max-width: 100%;"></a></p> <ul dir="auto"> <li>Batch mode (JSON flavor)</li> </ul> <p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/218502/108764902-71634a80-7553-11eb-9678-fd304995fa64.png"><img src="https://user-images.githubusercontent.com/218502/108764902-71634a80-7553-11eb-9678-fd304995fa64.png" alt="batch" style="max-width: 100%;"></a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Quick summary of the CVEs</h2><a id="user-content-quick-summary-of-the-cves" class="anchor" aria-label="Permalink: Quick summary of the CVEs" href="#quick-summary-of-the-cves"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>CVE-2017-5753</strong> bounds check bypass (Spectre Variant 1)</p> <ul dir="auto"> <li>Impact: Kernel & all software</li> <li>Mitigation: recompile software <em>and</em> kernel with a modified compiler that introduces the LFENCE opcode at the proper positions in the resulting code</li> <li>Performance impact of the mitigation: negligible</li> </ul> <p dir="auto"><strong>CVE-2017-5715</strong> branch target injection (Spectre Variant 2)</p> <ul dir="auto"> <li>Impact: Kernel</li> <li>Mitigation 1: new opcode via microcode update that should be used by up to date compilers to protect the BTB (by flushing indirect branch predictors)</li> <li>Mitigation 2: introducing "retpoline" into compilers, and recompile software/OS with it</li> <li>Performance impact of the mitigation: high for mitigation 1, medium for mitigation 2, depending on your CPU</li> </ul> <p dir="auto"><strong>CVE-2017-5754</strong> rogue data cache load (Meltdown)</p> <ul dir="auto"> <li>Impact: Kernel</li> <li>Mitigation: updated kernel (with PTI/KPTI patches), updating the kernel is enough</li> <li>Performance impact of the mitigation: low to medium</li> </ul> <p dir="auto"><strong>CVE-2018-3640</strong> rogue system register read (Variant 3a)</p> <ul dir="auto"> <li>Impact: TBC</li> <li>Mitigation: microcode update only</li> <li>Performance impact of the mitigation: negligible</li> </ul> <p dir="auto"><strong>CVE-2018-3639</strong> speculative store bypass (Variant 4)</p> <ul dir="auto"> <li>Impact: software using JIT (no known exploitation against kernel)</li> <li>Mitigation: microcode update + kernel update making possible for affected software to protect itself</li> <li>Performance impact of the mitigation: low to medium</li> </ul> <p dir="auto"><strong>CVE-2018-3615</strong> l1 terminal fault (Foreshadow-NG SGX)</p> <ul dir="auto"> <li>Impact: Kernel & all software (any physical memory address in the system)</li> <li>Mitigation: microcode update</li> <li>Performance impact of the mitigation: negligible</li> </ul> <p dir="auto"><strong>CVE-2018-3620</strong> l1 terminal fault (Foreshadow-NG SMM)</p> <ul dir="auto"> <li>Impact: Kernel & System management mode</li> <li>Mitigation: updated kernel (with PTE inversion)</li> <li>Performance impact of the mitigation: negligible</li> </ul> <p dir="auto"><strong>CVE-2018-3646</strong> l1 terminal fault (Foreshadow-NG VMM)</p> <ul dir="auto"> <li>Impact: Virtualization software and Virtual Machine Monitors</li> <li>Mitigation: disable ept (extended page tables), disable hyper-threading (SMT), or updated kernel (with L1d flush)</li> <li>Performance impact of the mitigation: low to significant</li> </ul> <p dir="auto"><strong>CVE-2018-12126</strong> [MSBDS] Microarchitectural Store Buffer Data Sampling (Fallout)</p> <p dir="auto"><strong>CVE-2018-12130</strong> [MFBDS] Microarchitectural Fill Buffer Data Sampling (ZombieLoad)</p> <p dir="auto"><strong>CVE-2018-12127</strong> [MLPDS] Microarchitectural Load Port Data Sampling (RIDL)</p> <p dir="auto"><strong>CVE-2019-11091</strong> [MDSUM] Microarchitectural Data Sampling Uncacheable Memory (RIDL)</p> <ul dir="auto"> <li>Note: These 4 CVEs are similar and collectively named "MDS" vulnerabilities, the mitigation is identical for all</li> <li>Impact: Kernel</li> <li>Mitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data</li> <li>Performance impact of the mitigation: low to significant</li> </ul> <p dir="auto"><strong>CVE-2019-11135</strong> TSX Asynchronous Abort (TAA, ZombieLoad V2)</p> <ul dir="auto"> <li>Impact: Kernel</li> <li>Mitigation: microcode update + kernel update making possible to protect various CPU internal buffers from unprivileged speculative access to data</li> <li>Performance impact of the mitigation: low to significant</li> </ul> <p dir="auto"><strong>CVE-2018-12207</strong> machine check exception on page size changes (No eXcuses, iTLB Multihit)</p> <ul dir="auto"> <li>Impact: Virtualization software and Virtual Machine Monitors</li> <li>Mitigation: disable hugepages use in hypervisor, or update hypervisor to benefit from mitigation</li> <li>Performance impact of the mitigation: low to significant</li> </ul> <p dir="auto"><strong>CVE-2020-0543</strong> Special Register Buffer Data Sampling (SRBDS)</p> <ul dir="auto"> <li>Impact: Kernel</li> <li>Mitigation: microcode update + kernel update helping to protect various CPU internal buffers from unprivileged speculative access to data</li> <li>Performance impact of the mitigation: low</li> </ul> <p dir="auto"><strong>CVE-2022-40982</strong> Gather Data Sampling (GDS, Downfall)</p> <ul dir="auto"> <li>Impact: Kernel & all software</li> <li>Mitigation: either microcode update or disabling AVX feature</li> <li>Performance impact of the mitigation: TBD</li> </ul> <p dir="auto"><strong>CVE-2023-20569</strong> Return Address Security (Inception)</p> <ul dir="auto"> <li>Impact: Kernel & all software</li> <li>Mitigation: updated kernel & microcode</li> <li>Performance impact of the mitigation: low to significant depending on the mitigation</li> </ul> <p dir="auto"><strong>CVE-2023-20593</strong> Cross-Process Information Leak (Zenbleed)</p> <ul dir="auto"> <li>Impact: Kernel & all software</li> <li>Mitigation: either kernel mitigation by disabling a CPU optimization through an MSR bit, or CPU microcode mitigation</li> <li>Performance impact of the mitigation: TBD</li> </ul> <p dir="auto"><strong>CVE-2023-23583</strong> Redundant Prefix issue (Reptar)</p> <ul dir="auto"> <li>Impact: All software</li> <li>Mitigation: microcode update for the affected CPU</li> <li>Performance impact of the mitigation: low</li> </ul> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="4GV3OVEtExKdwF+S0siKik9u+Nc0ZDRzLC/CAy3ppfQNd3307dsVchyWrqhj+stbLbhDTeJNASvSEVac38pufQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Reptar, Downfall, Zenbleed, ZombieLoad, RIDL, Fallout, Foreshadow, Spectre, Meltdown vulnerability/mitigation checker for Linux & BSD </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/spectre" title="Topic: spectre" data-view-component="true" class="topic-tag topic-tag-link"> spectre </a> <a href="/topics/reptar" title="Topic: reptar" data-view-component="true" class="topic-tag topic-tag-link"> reptar </a> <a href="/topics/mitigation" title="Topic: mitigation" data-view-component="true" class="topic-tag topic-tag-link"> mitigation </a> <a href="/topics/meltdown" title="Topic: meltdown" data-view-component="true" class="topic-tag topic-tag-link"> meltdown </a> <a href="/topics/cve-2017-5754" title="Topic: cve-2017-5754" data-view-component="true" class="topic-tag topic-tag-link"> cve-2017-5754 </a> <a href="/topics/cve-2017-5715" title="Topic: cve-2017-5715" data-view-component="true" class="topic-tag topic-tag-link"> cve-2017-5715 </a> <a href="/topics/cve-2017-5753" title="Topic: cve-2017-5753" data-view-component="true" class="topic-tag topic-tag-link"> cve-2017-5753 </a> <a href="/topics/cve-2018-3640" title="Topic: cve-2018-3640" data-view-component="true" class="topic-tag topic-tag-link"> cve-2018-3640 </a> <a href="/topics/cve-2018-3639" title="Topic: cve-2018-3639" data-view-component="true" class="topic-tag topic-tag-link"> cve-2018-3639 </a> <a href="/topics/foreshadow" title="Topic: foreshadow" data-view-component="true" class="topic-tag topic-tag-link"> foreshadow </a> <a href="/topics/cve-2018-3615" title="Topic: cve-2018-3615" data-view-component="true" class="topic-tag topic-tag-link"> cve-2018-3615 </a> <a href="/topics/cve-2018-3620" title="Topic: cve-2018-3620" data-view-component="true" class="topic-tag topic-tag-link"> cve-2018-3620 </a> <a href="/topics/cve-2018-3646" title="Topic: cve-2018-3646" data-view-component="true" class="topic-tag topic-tag-link"> cve-2018-3646 </a> <a href="/topics/zombieload" title="Topic: zombieload" data-view-component="true" class="topic-tag topic-tag-link"> zombieload </a> <a href="/topics/cve-2019-11135" title="Topic: cve-2019-11135" data-view-component="true" class="topic-tag topic-tag-link"> cve-2019-11135 </a> <a href="/topics/downfall" title="Topic: downfall" data-view-component="true" class="topic-tag topic-tag-link"> downfall </a> </div> </div> <h3 class="sr-only">Resources</h3> <div class="mt-2"> <a class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:readme"}" href="#readme-ov-file"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book mr-2"> <path d="M0 1.75A.75.75 0 0 1 .75 1h4.253c1.227 0 2.317.59 3 1.501A3.743 3.743 0 0 1 11.006 1h4.245a.75.75 0 0 1 .75.75v10.5a.75.75 0 0 1-.75.75h-4.507a2.25 2.25 0 0 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data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> You can’t perform that action at this time. </div> <template id="site-details-dialog"> <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open> <summary role="button" aria-label="Close dialog"></summary> <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal"> <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div class="octocat-spinner my-6 js-details-dialog-spinner"></div> </details-dialog> </details> </template> <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;"> <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>