CVE-2026-22989
Full vulnerability record from the local CVENow database.
Description
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
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-01-23 16:15:54.970000
Last modified
2026-11-05 22:17:57.703000
View original CVE JSON
{
"id": "CVE-2026-22989",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-01-23T16:15:54.970",
"lastModified": "2026-11-05T22:17:57.703",
"vulnStatus": "Analyzed",
"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'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()."
},
{
"lang": "es",
"value": "Se ha resuelto la siguiente vulnerabilidad en el kernel de Linux:\n\nnfsd: comprobar que el servidor está en ejecución en unlock_filesystem\n\nSi estamos intentando desbloquear el sistema de archivos a través de una interfaz de administración y nfsd no está en ejecución, se provoca la caída 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()."
}
],
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"fs/nfsd/state.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"source": "[email protected]",
"type": "Primary",
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"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,
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"ssvcV203": [
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-05T21:17:53.325028Z",
"id": "CVE-2026-22989",
"options": [
{
"exploitation": "none"
},
{
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"role": "CISA Coordinator",
"version": "2.0.3"
}
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
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"configurations": [
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