No exploitation reported

CVE-2009-4272

No exploitation reported by the sources we read.

Published2010-01-27
WeaknessCWE-667

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing "emergency" in which a hash chain is too long. NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.

Timeline

dates in UTC

2010-01-2717:30CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2009-4272?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2009-4272?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Linux linux kernelversion to verify

Branch	Affected	Fixed in	Source
2.6	= 2.6.18	no fix published	NVD

Redhat enterprise linux desktop

Branch	Affected	Fixed in	Source
5.0	= 5.0	no fix published	NVD

Redhat enterprise linux eus

Branch	Affected	Fixed in	Source
5.4	= 5.4	no fix published	NVD

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

rhn.redhat.comVendor Advisory
rhn.redhat.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-667read 2026-10-23
FIRST EPSSEPSS score11.1 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2010-01-27
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2009-4272?

Is CVE-2009-4272 actively exploited?

Active exploitation of CVE-2009-4272 has not been confirmed. Its EPSS score was 11.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2009-4272?

CVE-2009-4272 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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