{
  "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-2026-89662",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89662",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-11T19:45:49.833Z",
    "updatedAt": "2026-10-19T08:50:33.792Z",
    "importedAt": "2026-10-24T01:58:35.090Z",
    "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": "NFSD: Prevent lock owner use-after-free during client teardown",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Prevent lock owner use-after-free during client teardown\n\n__destroy_client() releases a client's open owners, but a lock owner\nwhose only reference is a blocked lock (nbl) stays on\ncl_ownerstr_hashtbl.  client_has_state() does not count a bare owner,\nso DESTROY_CLIENTID can reach __destroy_client() with such owners\npresent.\n\n__destroy_client() then walks the table, calling remove_blocked_locks()\non each owner without a reference.  Freeing a blocked lock drops the\nowner reference held via flc_owner.  The per-net laundromat reaps\nblocked locks from nn->blocked_locks_lru independently of client state.\nThe two paths share blocked_locks_lock only for the list splice, not\nthe owner's lifetime.  The laundromat therefore frees the owner as\n__destroy_client() dereferences it, a NULL dereference in\nremove_blocked_locks().\n\nnfsd4_release_lockowner() holds a reference across the same call;\n__destroy_client() does not.  Hold cl_lock across the walk, taking a\nreference and unhashing each owner, then drop it before\nremove_blocked_locks() and nfs4_put_stateowner(), which take\nblocked_locks_lock and cl_lock.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "42d7954b0a1907d4ef122aef94561952a033cdc3"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b8bad5a11416b26cc7fd4b18fba46d75ff636558"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1ce74d1b7770e69735e8f8e509807af4ff9c8ee7"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a6ead6fff3a7d03e49845f048f7000a2e0d34431"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4804c58f73a80d12df1de323bf97a164f6ee8743"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8cf4ff0a7c083dd5e0067f517d63979b74b66649"
            },
            {
              "version": "68ef3bc3166468678d5e1fdd216628c35bd1186f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5e2fa29d223a9a1e6a948e40b109d09081d1decd"
            },
            {
              "version": "e294c4c2d33b7307a89cdf31bec08a112d6a9297",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "797bfd05d4040fbf766198b3cfcc1838002cc890",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "0f44e9da465ea259b6c9f31a627f3c50a16e1679",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.9.91",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.10"
            },
            {
              "version": "4.14.31",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "4.15.14",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.16"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.16",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.16"
            },
            {
              "version": "5.10.270",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.221",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.188",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.157",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.109",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.50",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}