{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-22980","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.936Z","datePublished":"2026-01-23T15:24:02.924Z","dateUpdated":"2026-05-11T21:57:40.292Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:57:40.292Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: provide locking for v4_end_grace\n\nWriting to v4_end_grace can race with server shutdown and result in\nmemory being accessed after it was freed - reclaim_str_hashtbl in\nparticularly.\n\nWe cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is\nheld while client_tracking_op->init() is called and that can wait for\nan upcall to nfsdcltrack which can write to v4_end_grace, resulting in a\ndeadlock.\n\nnfsd4_end_grace() is also called by the landromat work queue and this\ndoesn't require locking as server shutdown will stop the work and wait\nfor it before freeing anything that nfsd4_end_grace() might access.\n\nHowever, we must be sure that writing to v4_end_grace doesn't restart\nthe work item after shutdown has already waited for it.  For this we\nadd a new flag protected with nn->client_lock.  It is set only while it\nis safe to make client tracking calls, and v4_end_grace only schedules\nwork while the flag is set with the spinlock held.\n\nSo this patch adds a nfsd_net field \"client_tracking_active\" which is\nset as described.  Another field \"grace_end_forced\", is set when\nv4_end_grace is written.  After this is set, and providing\nclient_tracking_active is set, the laundromat is scheduled.\nThis \"grace_end_forced\" field bypasses other checks for whether the\ngrace period has finished.\n\nThis resolves a race which can result in use-after-free."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/netns.h","fs/nfsd/nfs4state.c","fs/nfsd/nfsctl.c","fs/nfsd/state.h"],"versions":[{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"ca97360860eb02e3ae4ba42c19b439a0fcecbf06","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"e8bfa2401d4c51eca6e48e9b33c798828ca9df61","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"34eb22836e0cdba093baac66599d68c4cd245a9d","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"06600719d0f7a723811c45e4d51f5b742f345309","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"ba4811c8b433bfa681729ca42cc62b6034f223b0","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"53f07d095e7e680c5e4569a55a019f2c0348cdc6","status":"affected","versionType":"git"},{"version":"7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6","lessThan":"2857bd59feb63fcf40fe4baf55401baea6b4feb4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/netns.h","fs/nfsd/nfs4state.c","fs/nfsd/nfsctl.c","fs/nfsd/state.h"],"versions":[{"version":"3.18","status":"affected"},{"version":"0","lessThan":"3.18","status":"unaffected","versionType":"semver"},{"version":"5.10.248","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.198","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.161","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.121","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.66","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.6","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.1.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.6.121"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.12.66"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.18.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ca97360860eb02e3ae4ba42c19b439a0fcecbf06"},{"url":"https://git.kernel.org/stable/c/e8bfa2401d4c51eca6e48e9b33c798828ca9df61"},{"url":"https://git.kernel.org/stable/c/34eb22836e0cdba093baac66599d68c4cd245a9d"},{"url":"https://git.kernel.org/stable/c/06600719d0f7a723811c45e4d51f5b742f345309"},{"url":"https://git.kernel.org/stable/c/ba4811c8b433bfa681729ca42cc62b6034f223b0"},{"url":"https://git.kernel.org/stable/c/53f07d095e7e680c5e4569a55a019f2c0348cdc6"},{"url":"https://git.kernel.org/stable/c/2857bd59feb63fcf40fe4baf55401baea6b4feb4"}],"title":"nfsd: provide locking for v4_end_grace","x_generator":{"engine":"bippy-1.2.0"}}}}