Vulnerability CVE-2011-4622
Published: 2012-01-27   Modified: 2012-02-13

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.

Type:

CWE-noinfo

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Redhat -> KVM 

 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
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