Vulnerability Monitor

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CVE-2009-4031

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.

Security Impact Summary

CVE-2009-4031 is a security vulnerability that . Impacting 1 product from linux organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2009-11-29T13:07:32.250

Last Modified

2026-04-23T00:35:47.467

Status

Modified

Source

[email protected]

Severity

CVSSv2: 7.8 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	linux	linux_kernel	< 2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes
Operating System	linux	linux_kernel	2.6.32	Yes

References

http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88 ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html Third Party Advisory ([email protected])
http://secunia.com/advisories/37720 Third Party Advisory ([email protected])
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz Patch, Vendor Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2009/11/25/1 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2009/11/25/3 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/37130 Third Party Advisory, VDB Entry ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=541160 Issue Tracking, Third Party Advisory ([email protected])
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089 Third Party Advisory ([email protected])
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html Third Party Advisory ([email protected])
http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88 (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/37720 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2009/11/25/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2009/11/25/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/37130 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=541160 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For linux's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.