Is CVE-2009-4031 being actively exploited?

CVE-2009-4031 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-4031?

CVE-2009-4031 has a CVSS 2.0 base score of 7.8 (HIGH).

CVE-2009-4031

HIGH · CVSS 7.8EPSS 3.1%EU EUVD

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.

Key facts

CVSS score: 7.8 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness (CWE): CWE-20
EPSS score: 3.1% (88th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-4002)
Published: November 29, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-4002 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel
linux / linux kernel

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.html(Third Party Advisory)
http://secunia.com/advisories/37720(Third Party Advisory)
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz(Patch, Vendor Advisory)
http://www.openwall.com/lists/oss-security/2009/11/25/1(Mailing List, Third Party Advisory)
http://www.openwall.com/lists/oss-security/2009/11/25/3(Mailing List, Third Party Advisory)
http://www.securityfocus.com/bid/37130(Third Party Advisory, VDB Entry)
https://bugzilla.redhat.com/show_bug.cgi?id=541160(Issue Tracking, Third Party Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089(Third Party Advisory)
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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