{"id":"CVE-2026-22989","title":"nfsd: check that server is running in unlock_filesystem","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check that server is running in unlock_filesystem\n\nIf we are trying to unlock the filesystem via an administrative\ninterface and nfsd isn't running, it crashes th…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < d95499900fe52f3d461ed26b7a30bebea8f12914","Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < e06c9f6c0f554148d4921c2a15bd054260a054ac","Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < d0424066fcd294977f310964bed6f2a487fa4515","Linux 6.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:17:53.325028Z"},"published":"2026-01-23","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:23:14.041Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-22989","references":[{"url":"https://git.kernel.org/stable/c/d95499900fe52f3d461ed26b7a30bebea8f12914"},{"url":"https://git.kernel.org/stable/c/e06c9f6c0f554148d4921c2a15bd054260a054ac"},{"url":"https://git.kernel.org/stable/c/d0424066fcd294977f310964bed6f2a487fa4515"}],"tags":["cve.org"],"epss":0.00135,"epssPercentile":0.03011,"ingestedAt":"2026-11-05T22:38:32.059Z","slug":"CVE-2026-22989","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check that server is running in unlock_filesystem\n\nIf we are trying to unlock the filesystem via an administrative\ninterface and nfsd isn't running, it crashes the server. This\nhappens currently because nfsd4_revoke_states() access state\nstructures (eg., conf_id_hashtbl) that has been freed as a part\nof the server shutdown.\n\n[   59.465072] Call trace:\n[   59.465308]  nfsd4_revoke_states+0x1b4/0x898 [nfsd] (P)\n[   59.465830]  write_unlock_fs+0x258/0x440 [nfsd]\n[   59.466278]  nfsctl_transaction_write+0xb0/0x120 [nfsd]\n[   59.466780]  vfs_write+0x1f0/0x938\n[   59.467088]  ksys_write+0xfc/0x1f8\n[   59.467395]  __arm64_sys_write+0x74/0xb8\n[   59.467746]  invoke_syscall.constprop.0+0xdc/0x1e8\n[   59.468177]  do_el0_svc+0x154/0x1d8\n[   59.468489]  el0_svc+0x40/0xe0\n[   59.468767]  el0t_64_sync_handler+0xa0/0xe8\n[   59.469138]  el0t_64_sync+0x1ac/0x1b0\n\nEnsure this can't happen by taking the nfsd_mutex and checking that\nthe server is still up, and then holding the mutex across the call to\nnfsd4_revoke_states().\n\n## Affected\n\n- `Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < d95499900fe52f3d461ed26b7a30bebea8f12914`\n- `Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < e06c9f6c0f554148d4921c2a15bd054260a054ac`\n- `Linux >= 1ac3629bf012592cb0320e52a1cceb319a05ad17 < d0424066fcd294977f310964bed6f2a487fa4515`\n- `Linux 6.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}