CVE-2009-4031

kernel: KVM: x86 emulator: limit instructions to 15 bytes

Severity Score

7.8

*CVSS v2

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función do_insn_fetch en arch/x86/kvm/emulate.c en el emulador x86 KVM en el subsystem del kernel de Linux anterior a 2.6.32-rc8-next-20091125 intenta interpretar instrucciones que contienen demasiados bytes para ser válidas, lo que permite a un usuario invitado del sistema operativo provocar una denegación de servicio (incremento de la latencia de la planificación) en el sistema operativo anfitrión a través de manipulaciones no especificadas relacionadas con el soporte SMP.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2009-11-20 CVE Reserved
2009-11-27 CVE Published
2023-03-07 EPSS Updated
2024-08-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (11)

URL	Tag	Source
http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git%3Ba=commit%3Bh=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88	X_refsource_confirm
http://secunia.com/advisories/37720	Third Party Advisory
http://www.openwall.com/lists/oss-security/2009/11/25/1	Mailing List
http://www.openwall.com/lists/oss-security/2009/11/25/3	Mailing List
http://www.securityfocus.com/bid/37130	Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089	Signature

URL	Date	SRC

URL	Date	SRC
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gz	2023-02-13

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.html	2023-02-13
https://bugzilla.redhat.com/show_bug.cgi?id=541160	2009-12-23
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.html	2023-02-13
https://access.redhat.com/security/cve/CVE-2009-4031	2009-12-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 2.6.32 Search vendor "Linux" for product "Linux Kernel" and version " < 2.6.32"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc1		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc2		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc3		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc4		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc5		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc6		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				2.6.32 Search vendor "Linux" for product "Linux Kernel" and version "2.6.32"		rc7		Affected