SB20260815342 - Out-of-bounds write in Linux kernel xen driver
Published: August 15, 2026
Security Bulletin ID
SB20260815342
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-72380)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.9 [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]
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in pvcalls_front_event_handler() when processing a backend-supplied ring response with an out-of-range req_id. A local user can supply a crafted backend response to cause memory corruption.
The issue affects the Xen pvcalls frontend in deployments where the frontend does not trust its backend.
Remediation
Install update from vendor's website.