CVE-2026-22989 (GCVE-0-2026-22989)

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-01-23 15:24
VLAI?
Title
nfsd: check that server is running in unlock_filesystem
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: check that server is running in unlock_filesystem If we are trying to unlock the filesystem via an administrative interface and nfsd isn't running, it crashes the server. This happens currently because nfsd4_revoke_states() access state structures (eg., conf_id_hashtbl) that has been freed as a part of the server shutdown. [ 59.465072] Call trace: [ 59.465308] nfsd4_revoke_states+0x1b4/0x898 [nfsd] (P) [ 59.465830] write_unlock_fs+0x258/0x440 [nfsd] [ 59.466278] nfsctl_transaction_write+0xb0/0x120 [nfsd] [ 59.466780] vfs_write+0x1f0/0x938 [ 59.467088] ksys_write+0xfc/0x1f8 [ 59.467395] __arm64_sys_write+0x74/0xb8 [ 59.467746] invoke_syscall.constprop.0+0xdc/0x1e8 [ 59.468177] do_el0_svc+0x154/0x1d8 [ 59.468489] el0_svc+0x40/0xe0 [ 59.468767] el0t_64_sync_handler+0xa0/0xe8 [ 59.469138] el0t_64_sync+0x1ac/0x1b0 Ensure this can't happen by taking the nfsd_mutex and checking that the server is still up, and then holding the mutex across the call to nfsd4_revoke_states().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1ac3629bf012592cb0320e52a1cceb319a05ad17 , < d95499900fe52f3d461ed26b7a30bebea8f12914 (git)
Affected: 1ac3629bf012592cb0320e52a1cceb319a05ad17 , < e06c9f6c0f554148d4921c2a15bd054260a054ac (git)
Affected: 1ac3629bf012592cb0320e52a1cceb319a05ad17 , < d0424066fcd294977f310964bed6f2a487fa4515 (git)
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    Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.66 , ≤ 6.12.* (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4state.c",
            "fs/nfsd/nfsctl.c",
            "fs/nfsd/state.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d95499900fe52f3d461ed26b7a30bebea8f12914",
              "status": "affected",
              "version": "1ac3629bf012592cb0320e52a1cceb319a05ad17",
              "versionType": "git"
            },
            {
              "lessThan": "e06c9f6c0f554148d4921c2a15bd054260a054ac",
              "status": "affected",
              "version": "1ac3629bf012592cb0320e52a1cceb319a05ad17",
              "versionType": "git"
            },
            {
              "lessThan": "d0424066fcd294977f310964bed6f2a487fa4515",
              "status": "affected",
              "version": "1ac3629bf012592cb0320e52a1cceb319a05ad17",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4state.c",
            "fs/nfsd/nfsctl.c",
            "fs/nfsd/state.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.66",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.6",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc5",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027t 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\u0027t 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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-23T15:24:10.523Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "nfsd: check that server is running in unlock_filesystem",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-22989",
    "datePublished": "2026-01-23T15:24:10.523Z",
    "dateReserved": "2026-01-13T15:37:45.937Z",
    "dateUpdated": "2026-01-23T15:24:10.523Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-22989\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-23T16:15:54.970\",\"lastModified\":\"2026-01-26T15:03:33.357\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t 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\u0027t 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().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/d0424066fcd294977f310964bed6f2a487fa4515\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d95499900fe52f3d461ed26b7a30bebea8f12914\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e06c9f6c0f554148d4921c2a15bd054260a054ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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