{"id":"CVE-2026-89675","title":"kernel: nfsd: fix UAF in async copy cancel and shutdown (CVE-2026-89675)","summary":"A flaw was found in the Linux kernel's nfsd component. A race condition exists during asynchronous copy cancellation and shutdown operations, which can lead to a Use-After-Free (UAF) vulnerability. This allows an async copy object to be fr…","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 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T12:59:52+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89675"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532272"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89675"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89675"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89675.mbox"},{"url":"https://git.kernel.org/stable/c/62c0f6eaf050bb9284c1f9cac6ed1770092e6b95"},{"url":"https://git.kernel.org/stable/c/9031493ef7369d5c59c4bacc96f0c85965f09a98"},{"url":"https://git.kernel.org/stable/c/a385cf5e016b748babf94cc664e43a26e17db117"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00448,"epssPercentile":0.38333,"scores":{"vendor":6.4,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89675","body":"## Overview\n\nA flaw was found in the Linux kernel's nfsd component. A race condition exists during asynchronous copy cancellation and shutdown operations, which can lead to a Use-After-Free (UAF) vulnerability. This allows an async copy object to be freed or used after being freed, potentially causing memory corruption and system instability. This issue arises when a teardown caller races with the copy kernel thread, leading to incorrect memory management.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json)\n\n**kernel: nfsd: fix UAF in async copy cancel and shutdown** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-21.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208455,"id":"CVE-2026-89675","ts":1790005706034,"field":"cvss","old":"6.4","new":"7"},{"seq":208454,"id":"CVE-2026-89675","ts":1790005706034,"field":"severity","old":"medium","new":"high"},{"seq":202991,"id":"CVE-2026-89675","ts":1789403733260,"field":"cvss","old":"9.8","new":"6.4"},{"seq":202990,"id":"CVE-2026-89675","ts":1789403733260,"field":"severity","old":"critical","new":"medium"},{"seq":197766,"id":"CVE-2026-89675","ts":1789384318758,"field":"cvss","old":"6.4","new":"9.8"},{"seq":197765,"id":"CVE-2026-89675","ts":1789384318758,"field":"severity","old":"medium","new":"critical"},{"seq":183689,"id":"CVE-2026-89675","ts":1789356676960,"field":"cvss","old":"9.8","new":"6.4"},{"seq":183688,"id":"CVE-2026-89675","ts":1789356676960,"field":"severity","old":"critical","new":"medium"},{"seq":153542,"id":"CVE-2026-89675","ts":1789285351214,"field":"cvss","old":null,"new":"9.8"},{"seq":153541,"id":"CVE-2026-89675","ts":1789285351214,"field":"severity","old":"none","new":"critical"},{"seq":147536,"id":"CVE-2026-89675","ts":1789270211293,"field":"cvss","old":null,"new":"6.4"},{"seq":147535,"id":"CVE-2026-89675","ts":1789270211293,"field":"severity","old":"none","new":"medium"},{"seq":109298,"id":"CVE-2026-89675","ts":1789183731330,"field":"cvss","old":null,"new":"6.4"},{"seq":109297,"id":"CVE-2026-89675","ts":1789183731330,"field":"severity","old":"none","new":"medium"}]}