{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-54172",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-54172",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-30T12:08:46.146Z",
    "updatedAt": "2026-05-11T19:56:50.532Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "x86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction\n\nOn hardware that supports Indirect Branch Tracking (IBT), Hyper-V VMs\nwith ConfigVersion 9.3 or later support IBT in the guest. However,\ncurrent versions of Hyper-V have a bug in that there's not an ENDBR64\ninstruction at the beginning of the hypercall page. Since hypercalls are\nmade with an indirect call to the hypercall page, all hypercall attempts\nfail with an exception and Linux panics.\n\nA Hyper-V fix is in progress to add ENDBR64. But guard against the Linux\npanic by clearing X86_FEATURE_IBT if the hypercall page doesn't start\nwith ENDBR. The VM will boot and run without IBT.\n\nIf future Linux 32-bit kernels were to support IBT, additional hypercall\npage hackery would be needed to make IBT work for such kernels in a\nHyper-V VM.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "991625f3dd2cbc4b787deb0213e2bcf8fa264b21",
              "status": "affected",
              "versionType": "git",
              "lessThan": "98cccbd0a19a161971bc7f7feb10577adc62c400"
            },
            {
              "version": "991625f3dd2cbc4b787deb0213e2bcf8fa264b21",
              "status": "affected",
              "versionType": "git",
              "lessThan": "73626b70b361ddda7c380e52c236aa4f2487c402"
            },
            {
              "version": "991625f3dd2cbc4b787deb0213e2bcf8fa264b21",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d5ace2a776442d80674eff9ed42e737f7dd95056"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.18"
            },
            {
              "version": "6.1.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.4.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}