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CVE-2011-4622

4.9 · MEDIUM

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 virtua…

Published Jan 27, 2012redhatEPSS 0.35%

Overview

CVE-2011-4622 is a medium-severity vulnerability affecting redhat kvm. It was published on January 27, 2012 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from redhat. Update kvm to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reflists.opensuse.org/opensuse-security-announce/2012-05/msg00013.htmlReflists.opensuse.org/opensuse-security-announce/2013-06/msg00005.htmlRefpermalink.gmane.org/gmane.comp.emulators.kvm.devel/83564Refwww.openwall.com/lists/oss-security/2011/12/21/7Refwww.redhat.com/support/errata/RHSA-2012-0051.htmlRefwww.securityfocus.com/bid/51172Refwww.securitytracker.com/id?1026559Refbugzilla.redhat.com/show_bug.cgi?id=769721Reflists.opensuse.org/opensuse-security-announce/2012-05/msg00013.htmlReflists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html

How CyberStrike helps

Frequently asked questions

What is CVE-2011-4622?

CVE-2011-4622 is a medium-severity vulnerability affecting redhat kvm. It was published on January 27, 2012 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

How severe is CVE-2011-4622?

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-4622?

Check the references section for vendor advisories and patches from redhat. Update kvm to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-4622?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-4622 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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