{
  "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-2026-64600",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64600",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-23T05:46:56.149Z",
    "updatedAt": "2026-10-19T20:48:43.886Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "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": "xfs: resample the data fork mapping after cycling ILOCK",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don't refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dc11be133efca5fe3a2fb02b016dee825cc12f18"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b8c9aa832b52680ee40d6cab0efb081f9a69df05"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "50f0012da1040f69a4e788cd9aed587c9a04983f"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e705d81a7193dd19e69b8e2bad4696d78a4ea075"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "206c09b04dc5469c7ff14d8aceff2d47c88078d9"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "44f891bc088958399eec27f7604928694aa35581"
            },
            {
              "version": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.11",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.11"
            },
            {
              "version": "5.15.212",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.145",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.96",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.39",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}