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

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-05-11 21:57
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4state.c",
            "fs/nfsd/nfsctl.c",
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          "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()."
        }
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        "dateUpdated": "2026-05-11T21:57:50.971Z",
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    "cveId": "CVE-2026-22989",
    "datePublished": "2026-01-23T15:24:10.523Z",
    "dateReserved": "2026-01-13T15:37:45.937Z",
    "dateUpdated": "2026-05-11T21:57:50.971Z",
    "state": "PUBLISHED"
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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().\"},{\"lang\":\"es\",\"value\":\"Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\\n\\nnfsd: comprobar que el servidor est\u00e1 en ejecuci\u00f3n en unlock_filesystem\\n\\nSi estamos intentando desbloquear el sistema de archivos a trav\u00e9s de una interfaz de administraci\u00f3n y nfsd no est\u00e1 en ejecuci\u00f3n, se provoca la ca\u00edda del servidor. Esto ocurre actualmente porque nfsd4_revoke_states() accede a estructuras de estado (por ejemplo, conf_id_hashtbl) que han sido liberadas como parte del apagado del servidor.\\n\\n[   59.465072] Traza de llamada:\\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\\nAsegurar que esto no pueda ocurrir tomando el nfsd_mutex y comprobando que el servidor sigue activo, y luego manteniendo el mutex durante la llamada a nfsd4_revoke_states().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"1ac3629bf012592cb0320e52a1cceb319a05ad17\",\"lessThan\":\"d95499900fe52f3d461ed26b7a30bebea8f12914\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1ac3629bf012592cb0320e52a1cceb319a05ad17\",\"lessThan\":\"e06c9f6c0f554148d4921c2a15bd054260a054ac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1ac3629bf012592cb0320e52a1cceb319a05ad17\",\"lessThan\":\"d0424066fcd294977f310964bed6f2a487fa4515\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"6.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.66\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.6\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.9\",\"versionEndExcluding\":\"6.12.66\",\"matchCriteriaId\":\"49616A55-2473-4303-ADBB-059630B30A6F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.6\",\"matchCriteriaId\":\"879529BC-5B4C-4EBE-BF1D-1A31404A8B2E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/d0424066fcd294977f310964bed6f2a487fa4515\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d95499900fe52f3d461ed26b7a30bebea8f12914\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e06c9f6c0f554148d4921c2a15bd054260a054ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:17:56+00:00",
      "cve": "CVE-2026-22989",
      "id": "CVE-2026-22989",
      "initial_release_date": "2026-01-23T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: check that server is running in unlock_filesystem",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22989.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:34:18Z",
      "cve": "CVE-2026-22989",
      "id": "CVE-2026-22989",
      "initial_release_date": "2026-01-28T00:25:05Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "569",
      "product_status:known_not_affected": "79",
      "product_status:recommended": "244",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-22989",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-22989.json",
      "version": "18"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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