CVE-2025-21900

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

If the file is sillyrenamed, and slated for delete on close, it is possible for a server reboot to triggeer an open reclaim, with can again race with the application call to close(). When that happens, the call to put_nfs_open_context() can trigger a synchronous delegreturn call which deadlocks because it is not marked as privileged.

Instead, ensure that the call to nfs4_inode_return_delegation_on_close() catches the delegreturn, and schedules it asynchronously.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.35%
Percentil entre todas las CVEs puntuadas: 26
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-667
CWE-667

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix a deadlock when recovering state on a sillyrenamed file\n\nIf the file is sillyrenamed, and slated for delete on close, it is\npossible for a server reboot to triggeer an open reclaim, with can again\nrace with the application call to close(). When that happens, the call\nto put_nfs_open_context() can trigger a synchronous delegreturn call\nwhich deadlocks because it is not marked as privileged.\n\nInstead, ensure that the call to nfs4_inode_return_delegation_on_close()\ncatches the delegreturn, and schedules it asynchronously."
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