SB20260625215 - Out-of-bounds write in Linux kernel s390 kvm

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Main Vulnerability Database SB20260625215

SB20260625215 - Out-of-bounds write in Linux kernel s390 kvm

Published: June 25, 2026

Security Bulletin ID SB20260625215
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-52968)

CWE-ID: CWE-787 - Out-of-bounds write

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


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to out-of-bounds access in the KVM s390 PCI GAIT handling code when processing AIF and host alert forwarding operations. A local user can trigger crafted GAIT index usage to cause a denial of service.

The issue is caused by double-scaling pointer arithmetic that accesses element aisb*16 instead of aisb, and out-of-bounds accesses occur when aisb is 32 or greater.


Remediation

Install update from vendor's website.

References