SB20251226155 - Use-after-free in Linux kernel platforms pseries
Published: December 26, 2025 Updated: December 31, 2025
Security Bulletin ID
SB20251226155
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-2023-54042)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the vas_deallocate_window() function in arch/powerpc/platforms/pseries/vas.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/421cd1544480f2458042fe7f4913a2069c4d7251
- https://git.kernel.org/stable/c/4e82f92c349ea603736ade1e814861c0182a55ad
- https://git.kernel.org/stable/c/b4bda59b47879cce38a6ec5a01cd3cac702b5331
- https://git.kernel.org/stable/c/db8657fdd53c5e3069149d7f957cb60e63027bb2
- https://git.kernel.org/stable/c/f7d92313002b2d543500cc417d8079aaed1fb0a8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.121