#VU103011 Use-after-free in Linux kernel - CVE-2025-21631
Published: January 20, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU103011
Vulnerability risk: Low
CVSSv4.0: 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-2025-21631
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
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 bfq_waker_bfqq() function in block/bfq-iosched.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/2550149fcdf2934155ff625d76ad4e3d4b25bbc6
- https://git.kernel.org/stable/c/bc2aeb35ff167e0c6b0cedf0c96a5c41e6cba1ed
- https://git.kernel.org/stable/c/be3eed59ac01f429ac10aaa46e26f653bcf581ab
- https://git.kernel.org/stable/c/fcede1f0a043ccefe9bc6ad57f12718e42f63f1d
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.177
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.125
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.72