{"id":"CVE-2026-89484","title":"lockd: fix NULL dereference on lockowner allocation failure","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: fix NULL dereference on lockowner allocation failure\n\nnlmclnt_locks_init_private() installs NLM file lock operations even when\nnlmclnt_find_lockowner() fails to …","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":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6db5af172ccc3223c8f730a9a4212f6427feee3e","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 07adfbb3de7529f58ca708a97ead7fa4fdb71056","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d662f7fc04fde305a27f304b3cd19b614d366839","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 51af080ca4e553256c59a75a877b9b4fff828311","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c7fc129db061c7daab841c4f3c342d894832362","Linux 2.6.12"],"published":"2026-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:47:36.031Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89484","references":[{"url":"https://git.kernel.org/stable/c/6db5af172ccc3223c8f730a9a4212f6427feee3e"},{"url":"https://git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056"},{"url":"https://git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839"},{"url":"https://git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311"},{"url":"https://git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362"},{"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"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10584,"ingestedAt":"2026-09-14T00:35:28.530Z","slug":"CVE-2026-89484","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nlockd: fix NULL dereference on lockowner allocation failure\n\nnlmclnt_locks_init_private() installs NLM file lock operations even when\nnlmclnt_find_lockowner() fails to allocate a lockowner. nlmclnt_proc()\nthen returns -ENOMEM, but the VFS still tears down the partially\ninitialized file_lock and calls locks_release_private().\n\nThat invokes nlmclnt_locks_release_private(), which dereferences\nfl->fl_u.nfs_fl.owner and crashes because the owner was never installed.\n\nClear fl_ops before attempting to initialize the NLM private state, and\ninstall the NLM lock operations only after a lockowner has been allocated\nsuccessfully.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6db5af172ccc3223c8f730a9a4212f6427feee3e`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 07adfbb3de7529f58ca708a97ead7fa4fdb71056`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d662f7fc04fde305a27f304b3cd19b614d366839`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 51af080ca4e553256c59a75a877b9b4fff828311`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c7fc129db061c7daab841c4f3c342d894832362`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89484.json)","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"}]}