SB20251226123 - Use-after-free in Linux kernel block
Published: December 26, 2025 Updated: December 31, 2025
Security Bulletin ID
SB20251226123
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2023-54107)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the blkg_free_workfn() and __blkg_release() functions in block/blk-cgroup.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/c7241babf0855d8a6180cd1743ff0ec34de40b4e
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.17
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3