Improper locking in Xen - CVE-2026-42489
Published: June 9, 2026
Vulnerability identifier: #VU134007
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-2026-42489
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Xen Project
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 lock management in domctl operations when acquiring a system-wide lock for operations that may not be executed in parallel. A local user can repeatedly invoke domctl operations to cause a denial of service.
The issue can allow a less privileged entity to stall an equally or more privileged entity, potentially affecting the entire host.
How to mitigate CVE-2026-42489
Install security update from vendor's website.