CVE-2012-3516: Citrix Xenserver

Medium severity, CVSS 6.9. EPSS: 0.4% chance of exploitation in the next 30 days.

The GNTTABOP_swap_grant_ref sub-operation in the grant table hypercall in Xen 4.2 and Citrix XenServer 6.0.2 allows local guest kernels or administrators to cause a denial of service (host crash) and possibly gain privileges via a crafted grant reference that triggers a write to an arbitrary hypervisor memory location.

Affected products

• Citrix Xenserver: up to and including 6.0.2
• Xen Xen: version 4.2.0 only

Published 2012-11-23. Last modified 2026-06-16.