{"id":"CVE-2026-89709","title":"kernel: lockd, nfsd: RCU-protect nlmsvc_ops dispatch (CVE-2026-89709)","summary":"A flaw was found in the Linux kernel's lockd and nfsd components. An unguarded dereference of nlmsvc_ops after the nfsd module is removed can lead to a NULL pointer dereference or a use-after-free condition. This vulnerability could allow …","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-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89709"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532208"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89709"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89709"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89709.mbox"},{"url":"https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9"},{"url":"https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0033,"epssPercentile":0.26288,"scores":{"vendor":4.4,"cna":8.1},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89709","body":"## Overview\n\nA flaw was found in the Linux kernel's lockd and nfsd components. An unguarded dereference of nlmsvc_ops after the nfsd module is removed can lead to a NULL pointer dereference or a use-after-free condition. This vulnerability could allow a local attacker to cause a denial of service.\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 7, Red Hat Enterprise Linux 8, 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 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json)\n\n**kernel: lockd, nfsd: RCU-protect nlmsvc_ops dispatch** — rated Moderate 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 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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\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":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208448,"id":"CVE-2026-89709","ts":1790005704964,"field":"cvss","old":"4.4","new":"7"},{"seq":208447,"id":"CVE-2026-89709","ts":1790005704964,"field":"severity","old":"medium","new":"high"},{"seq":202972,"id":"CVE-2026-89709","ts":1789403733171,"field":"cvss","old":"8.1","new":"4.4"},{"seq":202971,"id":"CVE-2026-89709","ts":1789403733171,"field":"severity","old":"high","new":"medium"},{"seq":197710,"id":"CVE-2026-89709","ts":1789384318503,"field":"cvss","old":"4.4","new":"8.1"},{"seq":197709,"id":"CVE-2026-89709","ts":1789384318503,"field":"severity","old":"medium","new":"high"},{"seq":183661,"id":"CVE-2026-89709","ts":1789356676827,"field":"cvss","old":"8.1","new":"4.4"},{"seq":183660,"id":"CVE-2026-89709","ts":1789356676827,"field":"severity","old":"high","new":"medium"},{"seq":153598,"id":"CVE-2026-89709","ts":1789285351436,"field":"cvss","old":null,"new":"8.1"},{"seq":153597,"id":"CVE-2026-89709","ts":1789285351436,"field":"severity","old":"none","new":"high"},{"seq":147604,"id":"CVE-2026-89709","ts":1789270211563,"field":"cvss","old":null,"new":"4.4"},{"seq":147603,"id":"CVE-2026-89709","ts":1789270211563,"field":"severity","old":"none","new":"medium"},{"seq":109352,"id":"CVE-2026-89709","ts":1789183731574,"field":"cvss","old":null,"new":"4.4"},{"seq":109351,"id":"CVE-2026-89709","ts":1789183731574,"field":"severity","old":"none","new":"medium"}]}