{"id":"CVE-2026-89701","title":"nfsd: validate nseconds in TIME_DELEG decode paths","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate nseconds in TIME_DELEG decode paths\n\nThe xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms\nstore a raw uint32_t nseconds directly into tv_…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-1284"],"vendor":"Linux","product":"Linux","affected":["Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 7e7b93da7fa2e77f977096251899d1410986adf6","Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 5eb489831a9fd4754f4baf26e6989efb66ce104c","Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 0f4a767340fad392bd656115b8752005518c9065","Linux 6.14"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:14.339Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89701","references":[{"url":"https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6"},{"url":"https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c"},{"url":"https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89701"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532154"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89701"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89701"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89701.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10637,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89701","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate nseconds in TIME_DELEG decode paths\n\nThe xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms\nstore a raw uint32_t nseconds directly into tv_nsec without enforcing\nnseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this\ncheck but the TIME_DELEG paths do not. A malformed timespec can\npropagate through notify_change() to disk.\n\nAdd range checks in both nfs4xdr.c (SETATTR path) and\nnfs4callback.c (CB_GETATTR path).\n\n## Affected\n\n- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 7e7b93da7fa2e77f977096251899d1410986adf6`\n- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 5eb489831a9fd4754f4baf26e6989efb66ce104c`\n- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 0f4a767340fad392bd656115b8752005518c9065`\n- `Linux 6.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208453,"id":"CVE-2026-89701","ts":1790005705543,"field":"cvss","old":"6.8","new":"5.5"},{"seq":204095,"id":"CVE-2026-89701","ts":1789490231415,"field":"cvss","old":null,"new":"6.8"},{"seq":204094,"id":"CVE-2026-89701","ts":1789490231415,"field":"severity","old":"none","new":"medium"},{"seq":147668,"id":"CVE-2026-89701","ts":1789270211811,"field":"cvss","old":null,"new":"6.8"},{"seq":147667,"id":"CVE-2026-89701","ts":1789270211811,"field":"severity","old":"none","new":"medium"},{"seq":109432,"id":"CVE-2026-89701","ts":1789183731892,"field":"cvss","old":null,"new":"6.8"},{"seq":109431,"id":"CVE-2026-89701","ts":1789183731892,"field":"severity","old":"none","new":"medium"}]}