CVE-2011-4622

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-01-27 · updated 2026-06-16

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.

Affected products

RedHat Kvm: 83

References

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
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

Get alerted when CVE-2011-4622 or the next vulnerability affects your stack