CVE-2016-6258: Citrix Xenserver

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries.

Affected products

• Citrix Xenserver: version 6.0 only; version 6.0.2 only; version 6.1 only; version 6.2.0 only; version 6.5.0 only; version 7.0 only
• Xen Xen: version 3.4.0 only; version 3.4.2 only; version 3.4.3 only; version 3.4.4 only; version 4.0.0 only; version 4.0.1 only; …

Published 2016-08-02. Last modified 2026-06-17.