{"id":"CVE-2026-89692","title":"kernel: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue (CVE-2026-89692)","summary":"A flaw was found in the Linux kernel's Network File System (NFS) daemon, `nfsd`. This vulnerability occurs when a delegation recall operation fails, leaving a critical internal flag uncleared. This prevents subsequent attempts to break the…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-911","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T14:05:57+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89692"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532481"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89692"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89692"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89692.mbox"},{"url":"https://git.kernel.org/stable/c/b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96"},{"url":"https://git.kernel.org/stable/c/b137930ee52e3ef38915a3511d4c070463b63a32"},{"url":"https://git.kernel.org/stable/c/cb2d0c4d1b3d301d042ed61365eaa8cb0141a254"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00432,"epssPercentile":0.36845,"scores":{"vendor":5.3,"cna":7.5},"ingestedAt":"2026-09-14T15:23:07.473Z","slug":"CVE-2026-89692","body":"## Overview\n\nA flaw was found in the Linux kernel's Network File System (NFS) daemon, `nfsd`. This vulnerability occurs when a delegation recall operation fails, leaving a critical internal flag uncleared. This prevents subsequent attempts to break the same delegation, leading to a denial of service where file operations or locks can stall indefinitely. This can disrupt access to shared network resources.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json)\n\n**kernel: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue** — 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 OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\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 Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203857,"id":"CVE-2026-89692","ts":1789490210198,"field":"cvss","old":"5.3","new":"5.5"},{"seq":202818,"id":"CVE-2026-89692","ts":1789403732489,"field":"cvss","old":"7.5","new":"5.3"},{"seq":202817,"id":"CVE-2026-89692","ts":1789403732489,"field":"severity","old":"high","new":"medium"},{"seq":197724,"id":"CVE-2026-89692","ts":1789384318557,"field":"cvss","old":"5.3","new":"7.5"},{"seq":197723,"id":"CVE-2026-89692","ts":1789384318557,"field":"severity","old":"medium","new":"high"},{"seq":183351,"id":"CVE-2026-89692","ts":1789356675001,"field":"cvss","old":"7.5","new":"5.3"},{"seq":183350,"id":"CVE-2026-89692","ts":1789356675001,"field":"severity","old":"high","new":"medium"},{"seq":153574,"id":"CVE-2026-89692","ts":1789285351340,"field":"cvss","old":null,"new":"7.5"},{"seq":153573,"id":"CVE-2026-89692","ts":1789285351340,"field":"severity","old":"none","new":"high"},{"seq":147143,"id":"CVE-2026-89692","ts":1789270196657,"field":"cvss","old":null,"new":"5.3"},{"seq":147142,"id":"CVE-2026-89692","ts":1789270196657,"field":"severity","old":"none","new":"medium"},{"seq":108894,"id":"CVE-2026-89692","ts":1789183729439,"field":"cvss","old":null,"new":"5.3"},{"seq":108893,"id":"CVE-2026-89692","ts":1789183729439,"field":"severity","old":"none","new":"medium"}]}