CVE-2017-10921: Xen

Critical severity, CVSS 10.0. EPSS: 2.5% chance of exploitation in the next 30 days.

The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, which allows guest OS users to cause a denial of service (count mismanagement and memory corruption) or obtain privileged host OS access, aka XSA-224 bug 2.

Affected products

• Xen Xen: up to and including 4.8.1

Published 2017-07-05. Last modified 2026-06-17.