Improper locking in Xen - CVE-2026-62426
Published: July 29, 2026
Vulnerability identifier: #VU140025
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-62426
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in sysctl operations when acquiring the system-wide sysctl lock. A local user can issue sysctl operations in a way that stalls other entities to cause a denial of service.
With XSM/Flask in use, lock acquisition for some operations occurs before permission checking.
How to mitigate CVE-2026-62426
Install security update from vendor's website.