Missing Release of Resource after Effective Lifetime in Xen - CVE-2026-102700
Published: October 13, 2026
Vulnerability identifier: #VU154193
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-102700
CWE-ID: CWE-772
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to failure to release a page reference in the GNTTAB_cache_flush error path when handling a cache-flush operation for a page owned by a special system domain. A local user can invoke the operation for such a page to cause a denial of service.
Only x86 systems are vulnerable. The relevant system domains are DOM_IO and DOM_COW. The most likely outcome affects Domain 0, potentially affecting the entire host, or another domain.
Affected software
Xen
Debian Linux
xen (Debian package)
Debian Linux
xen (Debian package)
How to mitigate CVE-2026-102700
Install security update from vendor's website.
xen (Debian package) - update to 4.20.4+39-gf1e1321c87-0+deb13u1