SB20260123119 - Buffer overflow in Linux kernel s390 mm
Published: January 23, 2026
Security Bulletin ID
SB20260123119
CSH 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 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2025-71155)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 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
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to memory corruption within the ptep_zap_swap_entry() and gmap_helper_zap_one_page() functions in arch/s390/mm/gmap_helpers.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.