CVE-2011-2901: Xen

Medium severity, CVSS 5.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.

Affected products

• Xen Xen: up to and including 3.3.0; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.1.3 only; version 3.1.4 only; …

Published 2013-10-01. Last modified 2026-06-16.