{"id":"CVE-2026-89658","title":"kernel: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup (CVE-2026-89658)","summary":"A flaw was found in the Linux kernel's Network File System Daemon (NFSD). During NFSv4.0 revoked-state cleanup, a race condition can occur where a client's state identifier (stateid) reference does not properly prevent the client from bein…","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-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T18:29:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89658"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532130"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89658"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89658"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89658.mbox"},{"url":"https://git.kernel.org/stable/c/0ae0d2b5c5a1b39c0b3c15d96b32a5b0c583d519"},{"url":"https://git.kernel.org/stable/c/7b4f8a1586c42d3afc3c0ac779af2db7ab1a5c55"},{"url":"https://git.kernel.org/stable/c/81cf7f1413862f87b078920c838460a6a88aa030"},{"url":"https://git.kernel.org/stable/c/b413ec5b23e3445dc9c4f273116078e2d4747626"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00608,"epssPercentile":0.4749,"scores":{"vendor":4.4,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89658","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System Daemon (NFSD). During NFSv4.0 revoked-state cleanup, a race condition can occur where a client's state identifier (stateid) reference does not properly prevent the client from being prematurely freed while still in use. This use-after-free vulnerability could allow a remote attacker to cause a denial of service (DoS) or potentially execute arbitrary code on the affected system.\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json)\n\n**kernel: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup** — 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 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 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205533,"id":"CVE-2026-89658","ts":1789576724335,"field":"cvss","old":"4.4","new":"7"},{"seq":205532,"id":"CVE-2026-89658","ts":1789576724335,"field":"severity","old":"medium","new":"high"},{"seq":202999,"id":"CVE-2026-89658","ts":1789403733292,"field":"cvss","old":"9.8","new":"4.4"},{"seq":202998,"id":"CVE-2026-89658","ts":1789403733292,"field":"severity","old":"critical","new":"medium"},{"seq":197803,"id":"CVE-2026-89658","ts":1789384320466,"field":"cvss","old":"4.4","new":"9.8"},{"seq":197802,"id":"CVE-2026-89658","ts":1789384320466,"field":"severity","old":"medium","new":"critical"},{"seq":183709,"id":"CVE-2026-89658","ts":1789356677051,"field":"cvss","old":"9.8","new":"4.4"},{"seq":183708,"id":"CVE-2026-89658","ts":1789356677051,"field":"severity","old":"critical","new":"medium"},{"seq":153514,"id":"CVE-2026-89658","ts":1789285351102,"field":"cvss","old":null,"new":"9.8"},{"seq":153513,"id":"CVE-2026-89658","ts":1789285351102,"field":"severity","old":"none","new":"critical"},{"seq":147756,"id":"CVE-2026-89658","ts":1789270212169,"field":"cvss","old":null,"new":"4.4"},{"seq":147755,"id":"CVE-2026-89658","ts":1789270212169,"field":"severity","old":"none","new":"medium"},{"seq":109518,"id":"CVE-2026-89658","ts":1789183732254,"field":"cvss","old":null,"new":"4.4"},{"seq":109517,"id":"CVE-2026-89658","ts":1789183732254,"field":"severity","old":"none","new":"medium"}]}