CVE-2009-4031

Name: CVE-2009-4031
Creator: NVD / NIST
Published: 2009-11-29T13:07:32.25+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.11%

Last modified Jun 16, 2026

CVE-2009-4031 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 3.11% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

3.11%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 2.6.32
Linux	Linux Kernel	2.6.32

References

http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.htmlThird Party Advisory
http://secunia.com/advisories/37720Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gzPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2009/11/25/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2009/11/25/3Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/37130Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=541160Issue Tracking, Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.htmlThird Party Advisory
http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.htmlThird Party Advisory
http://secunia.com/advisories/37720Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gzPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2009/11/25/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2009/11/25/3Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/37130Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=541160Issue Tracking, Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.htmlThird Party Advisory

Timeline

Published: Nov 29, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-4031?

How severe is CVE-2009-4031?

Severity scoring for CVE-2009-4031 is pending analysis. The EPSS model estimates a 3.11% probability of exploitation in the next 30 days.

How do I fix CVE-2009-4031?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-4031?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST