CVE-2017-12134: Citrix Xenserver

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

The xen_biovec_phys_mergeable function in drivers/xen/biomerge.c in Xen might allow local OS guest users to corrupt block device data streams and consequently obtain sensitive memory information, cause a denial of service, or gain host OS privileges by leveraging incorrect block IO merge-ability calculation.

Affected products

• Citrix Xenserver: version 6.0.2 only; version 6.2.0 only; version 6.5 only; version 7.0 only; version 7.1 only; version 7.2 only
• Xen Xen: any version

Published 2017-08-24. Last modified 2026-06-17.