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Fencer Vulns
high 7.5

CVE-2009-4272 in the critical feed json

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 cau…

published 2010-01-27 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-4240

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.1%
EPSS 11.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 5 2.6.18-164.11.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.11.1.el5
  • kernel-xen RHEL 5 2.6.18-164.11.1.el5
  • kernel-kdump RHEL 5 2.6.18-164.11.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-164.11.1.el5
  • rhev-hypervisor RHEL 5 5.4-2.1.8.el5_4rhev2_1
  • rhev-hypervisor-pxe RHEL 5 5.4-2.1.8.el5_4rhev2_1

red hat advisories RHSA-2010:0046RHSA-2010:0095

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-4272 updated cvss 7.8

kernel: emergency route cache flushing leads to node deadlock

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Virtualization Hypervisor 5 rhev-hypervisor 5.4-2.1.8.el5_4rhev2_1, rhev-hypervisor-pxe 5.4-2.1.8.el5_4rhev2_1
    fixed: vendor fix RHSA-2010:0095
  • Red Hat Enterprise Linux (v. 5 server) kernel-headers 2.6.18-164.11.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel-headers 2.6.18-164.11.1.el5
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

11.05% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=545411 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.