Is CVE-2009-4272 being actively exploited?

CVE-2009-4272 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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

CVE-2009-4272 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2009-4272

HIGH · CVSS 7.5EPSS 11.1%EU EUVD

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.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-667
EPSS score: 11.1% (96th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-4240)
Published: January 27, 2010
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-4240 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

linux / linux kernel
redhat / enterprise linux
redhat / enterprise linux desktop
redhat / enterprise linux eus
redhat / enterprise linux server
redhat / enterprise linux workstation
redhat / virtualization

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 5 OpenSSH-Server Cryptographic Module - Red Hat®, Inc. - FIPS 140 1384 - historical

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=73e42897e8e5619eacb787d2ce69be12f47cfc21(Broken Link)
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=b6280b47a7a42970d098a3059f4ebe7e55e90d8d(Broken Link)
http://support.avaya.com/css/P8/documents/100073666(Third Party Advisory)
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31(Broken Link)
http://www.openwall.com/lists/oss-security/2010/01/20/1(Mailing List)
http://www.openwall.com/lists/oss-security/2010/01/20/6(Mailing List)
https://bugzilla.redhat.com/show_bug.cgi?id=545411(Exploit, Issue Tracking)
https://exchange.xforce.ibmcloud.com/vulnerabilities/55808(Third Party Advisory, VDB Entry)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11167(Broken Link)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7026(Broken Link)
https://rhn.redhat.com/errata/RHSA-2010-0046.html(Vendor Advisory)
https://rhn.redhat.com/errata/RHSA-2010-0095.html(Vendor Advisory)

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

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