Manuel Bouyer

**Name of the Vulnerable Software and Affected Versions** Xen versions prior to 4.12 **Description** The issue allows x86 PV guest OS users to cause a denial of service by leveraging a long-running operation that exists to support restartability of PTE updates. It is related to an insufficient input validation mechanism in the Xen hypervisor, which can be exploited by an attacker to cause a denial of service. **Recommendations** For Xen versions prior to 4.12, update to version 4.12 or later to resolve the issue.