{
  "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-2026-31666",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31666",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-24T14:45:15.271Z",
    "updatedAt": "2026-10-19T18:56:02.816Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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 incorrect return value after changing leaf in lookup_extent_data_ref()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()\n\nAfter commit 1618aa3c2e01 (\"btrfs: simplify return variables in\nlookup_extent_data_ref()\"), the err and ret variables were merged into\na single ret variable. However, when btrfs_next_leaf() returns 0\n(success), ret is overwritten from -ENOENT to 0. If the first key in\nthe next leaf does not match (different objectid or type), the function\nreturns 0 instead of -ENOENT, making the caller believe the lookup\nsucceeded when it did not. This can lead to operations on the wrong\nextent tree item, potentially causing extent tree corruption.\n\nFix this by returning -ENOENT directly when the key does not match,\ninstead of relying on the ret variable.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1618aa3c2e0163f5ac34d514ae89474521910536",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4125a194db4a6cf91f619f38788272651cb97dce"
            },
            {
              "version": "1618aa3c2e0163f5ac34d514ae89474521910536",
              "status": "affected",
              "versionType": "git",
              "lessThan": "450e6a685d0cad95b15f8af152057bd0bf79f50b"
            },
            {
              "version": "1618aa3c2e0163f5ac34d514ae89474521910536",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ab1e022379c3c811aa72da8eb0c7507859a1d0f5"
            },
            {
              "version": "1618aa3c2e0163f5ac34d514ae89474521910536",
              "status": "affected",
              "versionType": "git",
              "lessThan": "316fb1b3169efb081d2db910cbbfef445afa03b9"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.10",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.10"
            },
            {
              "version": "6.12.82",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.23",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.13",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}