{"id":"CVE-2026-89669","title":"kernel: nfsd: initialize copy-notify stateid before publishing it (CVE-2026-89669)","summary":"A flaw was found in the `nfsd` component of the Linux kernel. A use-after-free vulnerability exists due to improper initialization of the copy-notify state ID before its publication. A remote attacker could exploit this by sending a crafte…","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 9","openshift_container_platform 4","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:11:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89669"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532111"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89669"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89669"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89669.mbox"},{"url":"https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6"},{"url":"https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b"},{"url":"https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55"},{"url":"https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595"},{"url":"https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2"},{"url":"https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f"},{"url":"https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b"},{"url":"https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00684,"epssPercentile":0.50727,"scores":{"vendor":7,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89669","body":"## Overview\n\nA flaw was found in the `nfsd` component of the Linux kernel. A use-after-free vulnerability exists due to improper initialization of the copy-notify state ID before its publication. A remote attacker could exploit this by sending a crafted `OFFLOAD_CANCEL` operation, leading to a race condition that frees the state ID prematurely. This could result in a use-after-free, potentially allowing for arbitrary code execution or denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json)\n\n**kernel: nfsd: initialize copy-notify stateid before publishing it** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208125,"id":"CVE-2026-89669","ts":1789922721845,"field":"cvss","old":"9.8","new":"7"},{"seq":208124,"id":"CVE-2026-89669","ts":1789922721845,"field":"severity","old":"critical","new":"high"},{"seq":197772,"id":"CVE-2026-89669","ts":1789384318781,"field":"cvss","old":"7.5","new":"9.8"},{"seq":197771,"id":"CVE-2026-89669","ts":1789384318781,"field":"severity","old":"high","new":"critical"},{"seq":183694,"id":"CVE-2026-89669","ts":1789356676984,"field":"cvss","old":"9.8","new":"7.5"},{"seq":183693,"id":"CVE-2026-89669","ts":1789356676984,"field":"severity","old":"critical","new":"high"},{"seq":153532,"id":"CVE-2026-89669","ts":1789285351174,"field":"cvss","old":null,"new":"9.8"},{"seq":153531,"id":"CVE-2026-89669","ts":1789285351174,"field":"severity","old":"none","new":"critical"},{"seq":147764,"id":"CVE-2026-89669","ts":1789270212199,"field":"cvss","old":null,"new":"7.5"},{"seq":147763,"id":"CVE-2026-89669","ts":1789270212199,"field":"severity","old":"none","new":"high"},{"seq":109514,"id":"CVE-2026-89669","ts":1789183732238,"field":"cvss","old":null,"new":"7.5"},{"seq":109513,"id":"CVE-2026-89669","ts":1789183732238,"field":"severity","old":"none","new":"high"}]}