#VU105432 Input validation error in Linux kernel - CVE-2025-21831

Vulnerability identifier: #VU105432

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-2025-21831

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 DECLARE_PCI_FIXUP_SUSPEND() function in arch/x86/pci/fixup.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/5ee3dd6e59b834e4d66e8b16fc684749ee40a257
https://git.kernel.org/stable/c/8852e056e297df1d8635ee7504e780d3184e45d0
https://git.kernel.org/stable/c/a78dfe50fffe6058afed2bb04c50c2c9a16664ee
https://git.kernel.org/stable/c/b1049f2d68693c80a576c4578d96774a68df2bad

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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.