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Vulnerability record · CVE-2009-4272 · published 27 January 2010

CVE-2009-4272: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 11% · top 4.2% CWE-667 · CWE-667
7.5CVSS 3.1 base score, v2 7.8
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
24References, 2 tagged exploit
16 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 ExploitIssue Tracking
https://exchange.xforce.ibmcloud.com/vulnerabilities/55808 Third Party AdvisoryVDB 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
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 ExploitIssue Tracking
https://exchange.xforce.ibmcloud.com/vulnerabilities/55808 Third Party AdvisoryVDB 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

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Source: NIST National Vulnerability Database (record CVE-2009-4272), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.