CVE-2011-4622: Red Hat Kvm

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

The create_pit_timer function in arch/x86/kvm/i8254.c in KVM 83, and possibly other versions, does not properly handle when Programmable Interval Timer (PIT) interrupt requests (IRQs) when a virtual interrupt controller (irqchip) is not available, which allows local users to cause a denial of service (NULL pointer dereference) by starting a timer.

Affected products

• Red Hat Kvm: version 83 only

Published 2012-01-27. Last modified 2026-06-16.