{"id":"CVE-2026-89484","title":"kernel: lockd: fix NULL dereference on lockowner allocation failure (CVE-2026-89484)","summary":"A flaw was found in the Linux kernel's `lockd` component. This vulnerability occurs when the Network Lock Manager (NLM) client attempts to initialize file lock operations without successfully allocating a lockowner. This can lead to a NULL…","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-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T10:15:53+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89484.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89484.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89484"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532110"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89484"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89484"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89484.mbox"},{"url":"https://git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056"},{"url":"https://git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362"},{"url":"https://git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311"},{"url":"https://git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.002,"epssPercentile":0.10107,"ingestedAt":"2026-09-14T00:35:28.530Z","slug":"CVE-2026-89484","body":"## Overview\n\nA flaw was found in the Linux kernel's `lockd` component. This vulnerability occurs when the Network Lock Manager (NLM) client attempts to initialize file lock operations without successfully allocating a lockowner. This can lead to a NULL pointer dereference during the release of the file lock, resulting in a system crash. An attacker could potentially exploit this to cause a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · 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-2026-89484.json)\n\n**kernel: lockd: fix NULL dereference on lockowner allocation failure** — rated Low 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\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 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206957,"id":"CVE-2026-89484","ts":1789749718647,"field":"cvss","old":"5.9","new":"5.5"},{"seq":204105,"id":"CVE-2026-89484","ts":1789490231456,"field":"cvss","old":null,"new":"5.9"},{"seq":204104,"id":"CVE-2026-89484","ts":1789490231456,"field":"severity","old":"none","new":"medium"},{"seq":147720,"id":"CVE-2026-89484","ts":1789270212029,"field":"cvss","old":null,"new":"5.9"},{"seq":147719,"id":"CVE-2026-89484","ts":1789270212029,"field":"severity","old":"none","new":"medium"},{"seq":109470,"id":"CVE-2026-89484","ts":1789183732039,"field":"cvss","old":null,"new":"5.9"},{"seq":109469,"id":"CVE-2026-89484","ts":1789183732039,"field":"severity","old":"none","new":"medium"}]}