{"id":"CVE-2026-89681","title":"kernel: nfsd: fix layout fence worker double-reference race (CVE-2026-89681)","summary":"A flaw was found in the Linux kernel's nfsd component. A race condition in the layout fence worker can cause a double-reference to a layout stateid. This occurs because the workqueue core clears a pending flag prematurely, allowing a new w…","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-772","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T11:06:06+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89681.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89681.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89681"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532389"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89681"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89681"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89681.mbox"},{"url":"https://git.kernel.org/stable/c/8580571227451384399b3fa53fcde19848c48e5a"},{"url":"https://git.kernel.org/stable/c/a278d361e0e8f242211891193d56483a7a9f47a8"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00379,"epssPercentile":0.31826,"scores":{"vendor":5.3,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89681","body":"## Overview\n\nA flaw was found in the Linux kernel's nfsd component. A race condition in the layout fence worker can cause a double-reference to a layout stateid. This occurs because the workqueue core clears a pending flag prematurely, allowing a new worker to be scheduled while another is still active. The duplicate reference is not properly released, leading to a memory leak.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89681.json)\n\n**kernel: nfsd: fix layout fence worker double-reference race** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\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\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208477,"id":"CVE-2026-89681","ts":1790005712935,"field":"cvss","old":"5.3","new":"7"},{"seq":208476,"id":"CVE-2026-89681","ts":1790005712935,"field":"severity","old":"medium","new":"high"},{"seq":202826,"id":"CVE-2026-89681","ts":1789403732563,"field":"cvss","old":"9.8","new":"5.3"},{"seq":202825,"id":"CVE-2026-89681","ts":1789403732563,"field":"severity","old":"critical","new":"medium"},{"seq":197752,"id":"CVE-2026-89681","ts":1789384318701,"field":"cvss","old":"5.3","new":"9.8"},{"seq":197751,"id":"CVE-2026-89681","ts":1789384318701,"field":"severity","old":"medium","new":"critical"},{"seq":183361,"id":"CVE-2026-89681","ts":1789356675044,"field":"cvss","old":"9.8","new":"5.3"},{"seq":183360,"id":"CVE-2026-89681","ts":1789356675044,"field":"severity","old":"critical","new":"medium"},{"seq":153554,"id":"CVE-2026-89681","ts":1789285351261,"field":"cvss","old":null,"new":"9.8"},{"seq":153553,"id":"CVE-2026-89681","ts":1789285351261,"field":"severity","old":"none","new":"critical"},{"seq":147265,"id":"CVE-2026-89681","ts":1789270205531,"field":"cvss","old":null,"new":"5.3"},{"seq":147264,"id":"CVE-2026-89681","ts":1789270205531,"field":"severity","old":"none","new":"medium"},{"seq":109024,"id":"CVE-2026-89681","ts":1789183730005,"field":"cvss","old":null,"new":"5.3"},{"seq":109023,"id":"CVE-2026-89681","ts":1789183730005,"field":"severity","old":"none","new":"medium"}]}