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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.
Publish Date : 2012-01-27 Last Update Date : 2017-12-29
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID CWE id is not defined for this vulnerability

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
AV:L/AC:L/Au:N/C:N/I:N/A:C 2011-12-21 2011-12-14
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- Related OVAL Definitions

Title Definition Id Class Family
DEPRECATED: ELSA-2012-0051 -- kvm security update (important) oval:org.mitre.oval:def:27879 unix
DEPRECATED: ELSA-2012-0350 -- kernel security and bug fix update (moderate) oval:org.mitre.oval:def:27856 unix
DSA-2389-1 linux-2.6 -- privilege escalation/denial of service/information leak oval:org.mitre.oval:def:15414 unix
ELSA-2012-2003 -- Unbreakable Enterprise kernel security and bug fix update (important) oval:org.mitre.oval:def:27914 unix
ELSA-2012:0051: kvm security update (Important) oval:org.mitre.oval:def:23102 unix
ELSA-2012:0350: kernel security and bug fix update (Moderate) oval:org.mitre.oval:def:23710 unix
RHSA-2012:0051: kvm security update (Important) oval:org.mitre.oval:def:20784 unix
RHSA-2012:0051: kvm security update (Important) oval:com.redhat.rhsa:def:20120051 unix
RHSA-2012:0350: kernel security and bug fix update (Moderate) oval:org.mitre.oval:def:21098 unix
RHSA-2012:0350: kernel security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20120350 unix
USN-1387-1 -- Linux kernel (Maverick backport) vulnerabilities oval:org.mitre.oval:def:14535 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2011-4622

# Product Type Vendor Product Version Update Edition Language
1 Application Redhat KVM 83 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Redhat KVM 1

- References For CVE-2011-4622 CONFIRM
SUSE SUSE-SU-2012:0616
BID 51172 Linux Kernel KVM 'create_pit_timer()' Function Local Denial of Service Vulnerability Release Date:2013-06-10
SUSE openSUSE-SU-2013:0925
MLIST [kvm] 20111214 [PATCH 1/2] KVM: x86: Prevent starting PIT timers in the absence of irqchip support
REDHAT RHSA-2012:0051
MLIST [oss-security] 20111221 Re: kernel: kvm: pit timer with no irqchip crashes the system
SECTRACK 1026559

- Metasploit Modules Related To CVE-2011-4622

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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