Vulnerability Details : CVE-2011-4622
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.
Vulnerability category: Memory CorruptionDenial of service
Products affected by CVE-2011-4622
- cpe:2.3:a:redhat:kvm:83:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2011-4622
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2011-4622
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:L/AC:L/Au:N/C:N/I:N/A:C |
3.9
|
6.9
|
NIST |
References for CVE-2011-4622
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http://www.openwall.com/lists/oss-security/2011/12/21/7
oss-security - Re: kernel: kvm: pit timer with no irqchip crashes the system
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https://bugzilla.redhat.com/show_bug.cgi?id=769721
769721 – (CVE-2011-4622) CVE-2011-4622 kernel: kvm: pit timer with no irqchip crashes the system
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http://www.securityfocus.com/bid/51172
Linux Kernel KVM 'create_pit_timer()' Function Local Denial of Service Vulnerability
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http://www.securitytracker.com/id?1026559
KVM PIT IRQ Bug Lets Local Users Deny Service - SecurityTracker
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http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
[security-announce] SUSE-SU-2012:0616-1: important: Security update for
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http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/83564
Patch
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http://www.redhat.com/support/errata/RHSA-2012-0051.html
Support
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http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html
[security-announce] openSUSE-SU-2013:0925-1: important: kernel: security
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