#VU106841 Integer overflow in Linux kernel - CVE-2025-21962

Vulnerability identifier: #VU106841

Vulnerability risk: Low

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

CVE-ID: CVE-2025-21962

CWE-ID: CWE-190

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 execute arbitrary code.

The vulnerability exists due to integer overflow within the smb3_fs_context_parse_param() function in fs/smb/client/fs_context.c. A local user can execute arbitrary code.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.15 - 5.15.179, 6.1 - 6.1.131, 6.6 - 6.6.83, 6.12 - 6.12.19, 6.13 - 6.13.7

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External links
https://git.kernel.org/stable/c/1c46673be93dd2954f44fe370fb4f2b8e6214224
https://git.kernel.org/stable/c/6c13fcb7cf59ae65940da1dfea80144e42921e53
https://git.kernel.org/stable/c/9968fcf02cf6b0f78fbacf3f63e782162603855a
https://git.kernel.org/stable/c/b24edd5c191c2689c59d0509f0903f9487eb6317
https://git.kernel.org/stable/c/d5a30fddfe2f2e540f6c43b59cf701809995faef
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.180
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.132
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.20
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.8
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.84

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?