{"id":"CVE-2026-89484","state":"PUBLISHED","title":"lockd: fix NULL dereference on lockowner allocation failure","description":"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 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.","publishedAt":"2026-09-11T19:43:38.740Z","updatedAt":"2026-10-30T12:31:54.911Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b61053a3795c2913a7af3ab6218acfdaf52fcafe","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6db5af172ccc3223c8f730a9a4212f6427feee3e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"07adfbb3de7529f58ca708a97ead7fa4fdb71056","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d662f7fc04fde305a27f304b3cd19b614d366839","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"51af080ca4e553256c59a75a877b9b4fff828311","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4c7fc129db061c7daab841c4f3c342d894832362","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/clntproc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/clntproc.c"]}],"references":["https://git.kernel.org/stable/c/b61053a3795c2913a7af3ab6218acfdaf52fcafe","https://git.kernel.org/stable/c/6db5af172ccc3223c8f730a9a4212f6427feee3e","https://git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056","https://git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839","https://git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311","https://git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89484.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89484","state":"PUBLISHED","datePublished":"2026-09-11T19:43:38.740Z","dateUpdated":"2026-10-30T12:31:54.911Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.712Z"},"containers":{"cna":{"title":"lockd: fix NULL dereference on lockowner allocation failure","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b61053a3795c2913a7af3ab6218acfdaf52fcafe","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6db5af172ccc3223c8f730a9a4212f6427feee3e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"07adfbb3de7529f58ca708a97ead7fa4fdb71056","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d662f7fc04fde305a27f304b3cd19b614d366839","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"51af080ca4e553256c59a75a877b9b4fff828311","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4c7fc129db061c7daab841c4f3c342d894832362","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/clntproc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/lockd/clntproc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b61053a3795c2913a7af3ab6218acfdaf52fcafe"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:54.911Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}