{
  "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-2026-89706",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89706",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-11T19:46:22.561Z",
    "updatedAt": "2026-10-19T08:51:19.292Z",
    "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: Reset write verifier when async COPY writeback fails",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Reset write verifier when async COPY writeback fails\n\nAsync COPY captures nn->writeverf at request time and reports it to\nthe client via CB_OFFLOAD after the worker kthread completes. When\nthe post-copy vfs_fsync_range() or filemap_check_wb_err() in\n_nfsd_copy_file_range() reports an error, the worker correctly\nleaves NFSD4_COPY_F_COMMITTED clear so that CB_OFFLOAD encodes\nwr_stable_how as NFS_UNSTABLE, but the server's write verifier is\nnot rotated.\n\nA client that receives NFS_UNSTABLE in CB_OFFLOAD follows up with\nCOMMIT to make the copied data durable. With the verifier\nunchanged, COMMIT returns the same value the client just received\nvia CB_OFFLOAD, and the client concludes the copy is durable --\nsilently dropping the data whose writeback in fact failed. This\nviolates the UNSTABLE+COMMIT durability contract (RFC 7862 section\n15.1, RFC 8881 section 18.32) and matches the bug just fixed in\nnfsd_vfs_write() and nfsd_commit().\n\nRotate nn->writeverf at the writeback-failure site. The async COPY\nworker has no svc_rqst, so commit_reset_write_verifier() is not\navailable here; calling nfsd_reset_write_verifier() directly\nmirrors the trace-less reset already used by\nnfsd_file_check_write_error() for the same purpose. Filter out\n-EAGAIN and -ESTALE, matching commit_reset_write_verifier(), since\nneither indicates a durable-storage failure.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "817c6eb975798647c4bbbfc9eb288aa413ec7f65",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cc5f7cef0659a27c13dd33edd8e2f79257b095c6"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c6d2f6372c7e0f76b9c148ff7696aec64da0b5b7"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8a08ffe73eb2aa6bc6f88763da7e2b55bab6493a"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6b13d26cc21b6320a3c61d5e4cee2ce9a589b181"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "31d4d0a62ec4bafbcdbad142f11ab1f90794b1d0"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "591134e059e3456180244a826d6917cdc183140b"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bf0cd31a9abcb728c17d79b4c2cc533612a8b6af"
            },
            {
              "version": "eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f5cb2276954cb80987a93ef9f9dfbfdbfc0f10b9"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}