CVE-2009-4031: linux linux_kernel Improper Input Validation

Modified

AliasesRHSA-2009:1659

Published 27-11-2009Last modified 07-08-2024

Vulnerability summary

CVE-2009-4031 is a high (CVSS 7.8) Improper Input Validation vulnerability in linux linux_kernel. EPSS estimates a 3.11% chance of exploitation in the next 30 days, higher than 87.8% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 7.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v2.0 (NVD)

EPSS score

3.11%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2

DSA-1962-1 RHSA-2009:1692

Timeline

27-11-2009
PublishedVulnerability first disclosed.
07-08-2024
Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

v2.07.8

EPSS trend

Probability

3.11%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.11% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Affected systems

Version check

Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.

Redhat5 products

kmod-kvm< 0:83-105.el5_4.13
kvm< 0:83-105.el5_4.13
kvm-debuginfo< 0:83-105.el5_4.13
kvm-qemu-img< 0:83-105.el5_4.13
kvm-tools< 0:83-105.el5_4.13

Linux1 product

linux_kernel< 2.6.32 | 2.6.32 | 2.6.32:rc1 | 2.6.32:rc2 | 2.6.32:rc3 | 2.6.32:rc4 | 2.6.32:rc5 | 2.6.32:rc6 | 2.6.32:rc7

2 vendors · 6 products

References

20 links

www.openwall.com/lists/oss-security/2009/11/25/1Mailing ListX Refsource MLISTThird Party Advisory
secunia.com/advisories/37720Third Party AdvisoryX Refsource SECUNIA
lists.opensuse.org/opensuse-security-announce/2010-03/msg00006.htmlVendor AdvisoryX Refsource SUSEThird Party Advisory
www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091125.gzX Refsource CONFIRMPatchVendor Advisory
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11089VDB EntrySignatureX Refsource OVALThird Party Advisory
www.openwall.com/lists/oss-security/2009/11/25/3Mailing ListX Refsource MLISTThird Party Advisory
www.redhat.com/archives/fedora-package-announce/2009-December/msg00777.htmlVendor AdvisoryX Refsource FEDORAThird Party Advisory
git.kernel.orgX Refsource CONFIRM
www.securityfocus.com/bid/37130VDB EntryX Refsource BIDThird Party Advisory
bugzilla.redhat.com/show_bug.cgi?id=541160X Refsource CONFIRMIssue TrackingThird Party AdvisoryREPORT

Show all 20 references