#VU104955 Use-after-free in Linux kernel - CVE-2025-21732

Vulnerability identifier: #VU104955

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21732

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the mlx5_ib_invalidate_range() function in drivers/infiniband/hw/mlx5/odp.c, within the mlx5_revoke_mr() function in drivers/infiniband/hw/mlx5/mr.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12 - 6.12.13

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External links
https://git.kernel.org/stable/c/5297f5ddffef47b94172ab0d3d62270002a3dcc1
https://git.kernel.org/stable/c/abb604a1a9c87255c7a6f3b784410a9707baf467
https://git.kernel.org/stable/c/b13d32786acabf70a7b04ed24b7468fc3c82977c
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.14

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?