CVE-2013-4329: The xenlight library (libxl) in Xen 4.0.x through 4.2.x, when IOMMU is disabled, provides access to a busma...

Security readout for executives and security teams

This Xen issue affects older virtualization hosts when PCI passthrough is used without IOMMU protection. A guest VM could reach a physical device too early and use DMA to affect the host, potentially causing denial of service or privilege gain. Exposure is limited to Xen 4.0.x through 4.2.x environments using libxl, HVM guest domains, and PCI passthrough while IOMMU is disabled or unavailable. Hosts without PCI passthrough, without affected Xen versions, or with proper IOMMU enforcement are less likely exposed. Prioritize remediation for legacy Xen platforms hosting untrusted or multi-tenant workloads with PCI passthrough. The business risk is host compromise or service disruption from a guest VM, but exposure depends on a specific older configuration. Mitigation focus: Apply vendor Xen security updates from Debian, SUSE, Gentoo, or the relevant platform vendor.; Do not assign PCI passthrough devices to HVM guests when IOMMU is disabled.; Enable and verify IOMMU before allowing PCI passthrough on Xen hosts..

Prepared

Jun 14, 2026, 15:32 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.