CVE-2018-19963: Xen

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Xen 4.11 allowing HVM guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because x86 IOREQ server resource accounting (for external emulators) was mishandled.

Affected products

• Xen Xen: version 4.11.0 only

Published 2018-12-08. Last modified 2026-06-17.