CVE-2015-8338: Xen

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM_increase_reservation, (2) XENMEM_populate_physmap, (3) XENMEM_exchange, and possibly other HYPERVISOR_memory_op suboperations, which allows ARM guest OS administrators to cause a denial of service (CPU consumption, guest reboot, or watchdog timeout and host reboot) and possibly have unspecified other impact via unknown vectors.

Affected products

• Xen Xen: up to and including 4.6.0

Published 2015-12-17. Last modified 2026-06-17.