{
  "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-2026-74321",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74321",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-15T05:58:17.485Z",
    "updatedAt": "2026-10-16T18:55:32.917Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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": "btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()\n\nIn the beginning of the loop, we try to obtain a locked delayed ref head,\nif 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(),\nwhich can return an error pointer. If the error pointer is -EAGAIN we do\na continue and go back to the beginning of the loop, which will not try\nagain to call btrfs_select_ref_head() since 'locked_ref' is no longer\nNULL but it's ERR_PTR(-EAGAIN), and then we do:\n\n   spin_lock(&locked_ref->lock);\n\nagainst a ERR_PTR(-EAGAIN) value, generating an invalid pointer\ndereference.\n\nFix this by ensuring that 'locked_ref' is set to NULL when\nbtrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count'\nas well, to prevent infinite looping. We do this by doing a goto to the\nbottom of the loop that already sets 'locked_ref' to NULL and does a\ncond_resched(), with an increment to 'count' right before the goto.\nThese measures were in place before the refactoring in commit 0110a4c43451\n(\"btrfs: refactor __btrfs_run_delayed_refs loop\") but were unintentionally\nlost afterwards.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c372ca227e16bace86f1df1fa4ae6849e2fcfa28"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a71143590ce9764dbcb47617647592ff8b4d48bc"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "65770111a2d47c2b15e20b2ba92bb12198f289d4"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "015dc4a1e0c2cba551d4620eba13d26d5081dc34"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ba9fa2ff5981589bb49094d3358c339b37c47f53"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9faa6b69ad73f03c7bde53e07d75a28822dc9a1a"
            },
            {
              "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25",
              "status": "affected",
              "versionType": "git",
              "lessThan": "486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.20",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.20"
            },
            {
              "version": "5.10.261",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "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": "6.12.97",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.40",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}