CVE-2011-1898: Citrix Xen

High severity, CVSS 7.4. EPSS: 0.9% chance of exploitation in the next 30 days.

Xen 4.1 before 4.1.1 and 4.0 before 4.0.2, when using PCI passthrough on Intel VT-d chipsets that do not have interrupt remapping, allows guest OS users to gain host OS privileges by "using DMA to generate MSI interrupts by writing to the interrupt injection registers."

Affected products

• Citrix Xen: version 4.0.0 only; version 4.0.1 only; version 4.1.0 only

Published 2011-08-12. Last modified 2026-06-16.