CVE-2026-22980 (GCVE-0-2026-22980)
Vulnerability from cvelistv5
Published
2026-01-23 15:24
Modified
2026-08-05 12:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly. We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock. nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will stop the work and wait for it before freeing anything that nfsd4_end_grace() might access. However, we must be sure that writing to v4_end_grace doesn't restart the work item after shutdown has already waited for it. For this we add a new flag protected with nn->client_lock. It is set only while it is safe to make client tracking calls, and v4_end_grace only schedules work while the flag is set with the spinlock held. So this patch adds a nfsd_net field "client_tracking_active" which is set as described. Another field "grace_end_forced", is set when v4_end_grace is written. After this is set, and providing client_tracking_active is set, the laundromat is scheduled. This "grace_end_forced" field bypasses other checks for whether the grace period has finished. This resolves a race which can result in use-after-free.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
Version: 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6
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\"fs/nfsd/nfs4state.c\", \"fs/nfsd/nfsctl.c\", \"fs/nfsd/state.h\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003einit() 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\u0027t 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\u0027t restart\\nthe work item after shutdown has already waited for it.  For this we\\nadd a new flag protected with nn-\u003eclient_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.161\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.121\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.66\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.6\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:57:40.292Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-22980\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:45:38.283Z\", \"dateReserved\": \"2026-01-13T15:37:45.936Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-23T15:24:02.924Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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