{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-22989",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-22989"
  ],
  "published": "2026-01-23T15:25:01Z",
  "summary": "nfsd: check that server is running in unlock_filesystem",
  "details": "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 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().",
  "affected": [
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-22989"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d95499900fe52f3d461ed26b7a30bebea8f12914"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e06c9f6c0f554148d4921c2a15bd054260a054ac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0424066fcd294977f310964bed6f2a487fa4515"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}