CVE-2010-4255: Citrix Xen

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

Affected products

• Citrix Xen: up to and including 4.0.1; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.1.2 only; version 3.1.3 only; …

Published 2011-01-25. Last modified 2026-06-16.