{"id":"CVE-2026-89666","title":"kernel: nfsd: reject out-of-range nseconds in NFSv3 SETATTR and create ops (CVE-2026-89666)","summary":"A flaw was found in the kernel. A remote attacker, acting as an NFSv3 client, can send malformed time values during SETATTR or create operations. This can lead to the corruption of on-disk metadata, resulting in incorrect timestamps for fi…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-190","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T08:54:51+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89666.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89666.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89666"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532519"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89666"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89666"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89666.mbox"},{"url":"https://git.kernel.org/stable/c/55341d8a5a0f5853e70d46f5a55cf06007808f1d"},{"url":"https://git.kernel.org/stable/c/54e02f5e32c52fb395f2ee02986a6c6d5608d22b"},{"url":"https://git.kernel.org/stable/c/e2543852152bcf9aeb57da17d9f9219f7df8aafb"},{"url":"https://git.kernel.org/stable/c/eb0eca7720662ba5847df1510e73801f7f473094"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.06451,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89666","body":"## Overview\n\nA flaw was found in the kernel. A remote attacker, acting as an NFSv3 client, can send malformed time values during SETATTR or create operations. This can lead to the corruption of on-disk metadata, resulting in incorrect timestamps for files. This issue affects filesystems that support nanosecond granularity, such as ext4 and XFS.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89666.json)\n\n**kernel: nfsd: reject out-of-range nseconds in NFSv3 SETATTR and create ops** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203927,"id":"CVE-2026-89666","ts":1789490226597,"field":"cvss","old":null,"new":"7"},{"seq":203926,"id":"CVE-2026-89666","ts":1789490226597,"field":"severity","old":"none","new":"high"},{"seq":147083,"id":"CVE-2026-89666","ts":1789270195096,"field":"cvss","old":null,"new":"6.8"},{"seq":147082,"id":"CVE-2026-89666","ts":1789270195096,"field":"severity","old":"none","new":"medium"},{"seq":108842,"id":"CVE-2026-89666","ts":1789183729211,"field":"cvss","old":null,"new":"6.8"},{"seq":108841,"id":"CVE-2026-89666","ts":1789183729211,"field":"severity","old":"none","new":"medium"}]}