#VU106806 Input validation error in Linux kernel - CVE-2025-21970

Vulnerability identifier: #VU106806

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-2025-21970

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 mlx5_esw_bridge_lag_rep_get(), mlx5_esw_bridge_is_local() and mlx5_esw_bridge_switchdev_event() functions in drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12 - 6.12.19

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External links
https://git.kernel.org/stable/c/4b8eeed4fb105770ce6dc84a2c6ef953c7b71cbb
https://git.kernel.org/stable/c/5dd8bf6ab1d6db40f5d09603759fa88caec19e7f
https://git.kernel.org/stable/c/86ff45f5f61ae1d0d17f0f6d8797b052eacfd8f1
https://git.kernel.org/stable/c/bd7e3a42800743a7748c83243e4cafc1b995d4c4
https://git.kernel.org/stable/c/f7bf259a04271165ae667ad21cfc60c6413f25ca
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.20

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?