CVE-2025-21795

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21795
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03 Patch
https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908 Patch
https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7 Patch
https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 Patch
https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854 Patch
https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d Patch
https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
History

28 Oct 2025, 20:39

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE NVD-CWE-noinfo
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03 - () https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03 - Patch
References () https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908 - () https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908 - Patch
References () https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7 - () https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7 - Patch
References () https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 - () https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 - Patch
References () https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854 - () https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854 - Patch
References () https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d - () https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d - Patch
References () https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 - () https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 - Patch
CPE cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*

13 Mar 2025, 13:15

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSD: se corrige el bloqueo en nfsd4_shutdown_callback Si nfs4_client está en estado de cortesía, no tiene sentido enviar la devolución de llamada. Esto hace que nfsd4_shutdown_callback se bloquee ya que cl_cb_inflight no es 0. Este bloqueo dura unos 15 minutos hasta que TCP notifica a NFSD que se interrumpió la conexión. Este parche modifica nfsd4_run_cb_work para omitir la llamada RPC si nfs4_client está en estado de cortesía.
References
  • () https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 -
  • () https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 -

27 Feb 2025, 03:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-27 03:15

Updated : 2025-10-28 20:39

NVD link : CVE-2025-21795

Mitre link : CVE-2025-21795

CVE.ORG link : CVE-2025-21795

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo