Is CVE-2009-1242 being actively exploited?

CVE-2009-1242 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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

CVE-2009-1242 has a CVSS 2.0 base score of 4.9 (MEDIUM).

CVE-2009-1242

MEDIUM · CVSS 4.9EPSS 0.5%EU EUVD

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.

Key facts

CVSS score: 4.9 (v2.0)
Severity: MEDIUM
CVSS vector: AV:L/AC:L/Au:N/C:N/I:N/A:C
Weakness (CWE): CWE-20
EPSS score: 0.5% (41th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-1241)
Published: April 6, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-1241 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
fedoraproject / fedora
linux / linux kernel
opensuse / opensuse
opensuse / opensuse

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=16175a796d061833aacfbd9672235f2d2725df65
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00001.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00002.html(Mailing List, Third Party Advisory)
http://openwall.com/lists/oss-security/2009/04/01/3(Mailing List, Patch, Third Party Advisory)
http://patchwork.kernel.org/patch/15549/(Patch, Vendor Advisory)
http://secunia.com/advisories/34478(Third Party Advisory)
http://secunia.com/advisories/34981(Third Party Advisory)
http://secunia.com/advisories/35120(Third Party Advisory)
http://secunia.com/advisories/35121(Third Party Advisory)
http://secunia.com/advisories/35226(Third Party Advisory)
http://secunia.com/advisories/35387(Third Party Advisory)
http://secunia.com/advisories/35394(Third Party Advisory)
http://secunia.com/advisories/35656(Third Party Advisory)
http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-EFER-8585(Third Party Advisory)
http://wiki.rpath.com/Advisories:rPSA-2009-0084(Broken Link)
http://www.debian.org/security/2009/dsa-1787(Third Party Advisory)
http://www.debian.org/security/2009/dsa-1800(Third Party Advisory)
http://www.globalsecuritymag.com/Vigil-nce-Linux-kernel-denial-of%2C20090402%2C8311
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1(Broken Link)
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.29-git1.log(Broken Link)
http://www.securityfocus.com/archive/1/503610/100/0/threaded(Third Party Advisory, VDB Entry)
http://www.securityfocus.com/bid/34331(Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/usn-793-1(Third Party Advisory)
http://www.vupen.com/english/advisories/2009/0924(Broken Link)
https://bugzilla.redhat.com/show_bug.cgi?id=502109(Issue Tracking, Patch, Third Party Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/49594(Third Party Advisory, VDB Entry)
https://www.redhat.com/archives/fedora-package-announce/2009-May/msg01126.html(Third Party Advisory)

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

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