SB20260625216 - Out-of-bounds write in Linux kernel kvm

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260625216

SB20260625216 - Out-of-bounds write in Linux kernel kvm

Published: June 25, 2026

Security Bulletin ID SB20260625216
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

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-2026-52969)

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:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to an out-of-bounds write in kvm_reset_dirty_gfn() and the KVM dirty ring handling logic when processing rewritten dirty ring entries from a vcpu file descriptor. A local user can modify slot and offset fields in crafted dirty ring entries to cause memory corruption.

The issue is reachable from a process holding /dev/kvm and affects the legacy MMU path with shadow paging, allocated shadow roots, or a write-tracked slot.


Remediation

Install update from vendor's website.

References