CVE-2013-4368: Xen

Low severity, CVSS 1.9. EPSS: 0.4% chance of exploitation in the next 30 days.

The outs instruction emulation in Xen 3.1.x, 4.2.x, 4.3.x, and earlier, when using FS: or GS: segment override, uses an uninitialized variable as a segment base, which allows local 64-bit PV guests to obtain sensitive information (hypervisor stack content) via unspecified vectors related to stale data in a segment register.

Affected products

• Xen Xen: up to and including 4.3.0; 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 2013-10-17. Last modified 2026-06-16.