CVE-2015-5307: Canonical Ubuntu Linux

Medium severity, CVSS 4.9. EPSS: 0.6% chance of exploitation in the next 30 days.

The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Linux Linux Kernel: up to and including 4.2.3
• Oracle Vm VirtualBox: from 4.0.0, up to and including 4.0.34; from 4.1.0, up to and including 4.1.42; from 4.2.0, up to and including 4.2.34; from 4.3.0, up to and including 4.3.29; from 5.0.0, up to and including 5.0.8
• Xen Xen: version 4.3.0 only; version 4.3.1 only; version 4.3.2 only; version 4.3.3 only; version 4.3.4 only; version 4.4.0 only; …

Published 2015-11-16. Last modified 2026-06-17.