CVE-2018-12904: Canonical Ubuntu Linux

Medium severity, CVSS 4.9. EPSS: 1.2% chance of exploitation in the next 30 days.

In arch/x86/kvm/vmx.c in the Linux kernel before 4.17.2, when nested virtualization is used, local attackers could cause L1 KVM guests to VMEXIT, potentially allowing privilege escalations and denial of service attacks due to lack of checking of CPL.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only
• Linux Linux Kernel: before 4.17.2 (fixed in 4.17.2)

Published 2018-06-27. Last modified 2026-06-17.