Is CVE-2009-1242 in the CISA KEV catalog?

No. CVE-2009-1242 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-1242?

CVE-2009-1242 has a CVSS v2 base score of 4.9 (MEDIUM).

What is the EPSS score for CVE-2009-1242?

CVE-2009-1242 has an EPSS score of 0.47% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-1242?

Upgrade linux kernel to 2.6.29.1 or later.

CVE & CISA-KEV Catalog

CVE-2009-1242

MEDIUM

4.9

CVSS v2

NVD

Description

The vmx_set_msr function in arch/x86/kvm/vmx.c in the VMX implementation in the KVM subsystem in the Linux kernel before 2.6.29.1 on the i386 platform allows guest OS users to cause a denial of service (OOPS) by setting the EFER_LME (aka "Long mode enable") bit in the Extended Feature Enable Register (EFER) model-specific register, which is specific to the x86_64 platform.

CWE-20Improper Input Validation

How to fix

Remediation Available

linux kernelNVD

Affected:< 2.6.29.1Fixed in:2.6.29.1CVE-2009-1242derived 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

0.47%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

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.