Incorrect authorization in Xen - CVE-2026-102702
Published: October 13, 2026
Vulnerability identifier: #VU154195
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102702
CWE-ID: CWE-863
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt memory belonging to another domain.
The vulnerability exists due to improper authorization in GNTTABOP_cache_flush when handling cache-flush operations on memory mapped from another domain through the grant table interface. A local user can issue an invalidate-without-clean operation against a read-only grant mapping to corrupt memory belonging to another domain.
Only Arm systems are vulnerable.
Affected software
Xen
Debian Linux
xen (Debian package)
Debian Linux
xen (Debian package)
How to mitigate CVE-2026-102702
Install security update from vendor's website.
xen (Debian package) - update to 4.20.4+39-gf1e1321c87-0+deb13u1