Is CVE-2009-4031 in the CISA KEV catalog?

No. CVE-2009-4031 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-4031?

CVE-2009-4031 has a CVSS v2 base score of 7.8 (HIGH).

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

CVE-2009-4031 has an EPSS score of 3.11% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-4031?

Upgrade linux kernel to 2.6.32 or later.

CVE & CISA-KEV Catalog

CVE-2009-4031

HIGHEPSS 86th pctl

7.8

CVSS v2

NVD

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.

CWE-20Improper Input Validation

How to fix

Remediation Available

linux kernelNVD

Affected:< 2.6.32Fixed in:2.6.32CVE-2009-4031derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.11%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

kernel.org

Third-Party Advisory8

Other references1

git.kernel.org

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.