Missing Release of Resource after Effective Lifetime in Xen - CVE-2026-23556
Published: April 28, 2026
Vulnerability identifier: #VU128379
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/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-2026-23556
CWE-ID: CWE-772
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Xen Project
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper resource management in oxenstored quota use counts when tearing down and reusing domain IDs. A remote user can deliberately hit its quota and reboot a domain to cause a denial of service.
Only systems configured to use oxenstored are vulnerable.
How to mitigate CVE-2026-23556
Install security update from vendor's website.