CVE-2017-10917: Xen

Critical severity, CVSS 9.1. EPSS: 2.6% chance of exploitation in the next 30 days.

Xen through 4.8.x does not validate the port numbers of polled event channel ports, which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) or possibly obtain sensitive information, aka XSA-221.

Affected products

• Xen Xen: up to and including 4.8.1

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