CVE-2011-4622 Information

Description

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.

Reference

http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/83564 http://www.openwall.com/lists/oss-security/2011/12/21/7 http://www.redhat.com/support/errata/RHSA-2012-0051.html http://www.securityfocus.com/bid/51172 http://www.securitytracker.com/id?1026559 https://bugzilla.redhat.com/show_bug.cgi?id=769721