#VU105421 Buffer overflow in Linux kernel - CVE-2025-21826

Vulnerability identifier: #VU105421

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-2025-21826

CWE-ID: CWE-119

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 memory corruption within the nft_set_desc_concat_parse() and nft_set_desc_concat() functions in net/netfilter/nf_tables_api.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.1

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External links
https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220
https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752
https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d
https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32
https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.2

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?