{
  "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-2026-89712",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89712",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-11T19:46:27.018Z",
    "updatedAt": "2026-10-19T08:51:25.202Z",
    "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: restart ssc_expire_umount walk after dropping nfsd_ssc_lock",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock\n\nnfsd4_ssc_expire_umount() walks nn->nfsd_ssc_mount_list with\nlist_for_each_entry_safe(ni, tmp, ...).  For each expired entry it\nsets nsui_busy = true, drops nfsd_ssc_lock to run mntput() on the\nsource vfsmount, then reacquires the lock to list_del + kfree the\nentry and continue iterating via the macro's saved tmp pointer.\n\nThe nsui_busy flag protects the current ni from concurrent\nnfsd4_ssc_setup_dul() finders during the lock-drop window, but it\ndoes not pin tmp.  Another nfsd RPC thread that fails its source-\nserver mount and reaches nfsd4_ssc_cancel_dul() will, during that\nsame window, take nfsd_ssc_lock, list_del + kfree its own ssc_umount\nitem, and release the lock.  If that item is the saved tmp of the\nexpire walk, the next iteration dereferences a freed\nnfsd4_ssc_umount_item.\n\nRestart the walk from the head after the mntput() unlock window so\nno saved next pointer survives the lock-drop.  The list is bounded\nby the number of active inter-server source mounts (typically small)\nand the expire delayed-work runs periodically rather than per-IO,\nso the restart is cheap.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a4bc287943f5695209ff36bdc89f17b48d68fae7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2b59029b8f24a99b5d844af2da3950d39d36eeea"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d9e151fea5ed706c1284adacabd869b0be745db2"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "659ee3da073164e1e6e40dfcbc26eeed85845f93"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "60680ae7243b22de3d09be990d8e23bcfc4af837"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "77de363d9a1c8cd35f20482782c612cda085791a"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4ed8d2317aef21cc2a9e5a55d6b59860b4b151a8"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7377fa964b8aaf47cb04e5efcc4c82d15e8c2ce9"
            },
            {
              "version": "f4e44b393389c77958f7c58bf4415032b4cda15b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "036c1b182f4da65363e79ec0ac276edc6b7296e5"
            },
            {
              "version": "5.10.220",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.270"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.14"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}