#VU105087 Input validation error in Linux kernel - CVE-2025-21795

Vulnerability identifier: #VU105087

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21795

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the nfsd4_run_cb_work() function in fs/nfsd/nfs4callback.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.