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CVE-2009-4031

7.8 · HIGH

The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too ma…

Published Nov 29, 2009linuxCWE-20EPSS 3.11%

Overview

CVE-2009-4031 is a high-severity vulnerability affecting linux linux_kernel. It was published on November 29, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel 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
linuxlinux_kernel>= 0, < 2.6.32Affected

References

Refgit.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88Reflists.opensuse.org/opensuse-security-announce/2010-03/msg00006.htmlRefsecunia.com/advisories/37720Refwww.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gzRefwww.openwall.com/lists/oss-security/2009/11/25/1Refwww.openwall.com/lists/oss-security/2009/11/25/3Refwww.securityfocus.com/bid/37130Refbugzilla.redhat.com/show_bug.cgi?id=541160Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089Refwww.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4031?

CVE-2009-4031 is a high-severity vulnerability affecting linux linux_kernel. It was published on November 29, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2009-4031?

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-4031?

Check the references section for vendor advisories and patches from linux. Update linux_kernel 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-2009-4031?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4031 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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