CVE-2009-4272

highpriority · track · 34EPSS 0.111 · 96 %ileEUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

11.1% (96th) EPSS

CVSS 7.8 · high

Is it mine?

7 products

Check your exposure

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-667USprimary

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
linux linux kernel= 2.6.18nvdUScpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhat enterprise linux desktop= 5.0nvdUScpe:2.3:o:redhat:enterprise_linux_desktop:*:*:*:*:*:*:*:*
redhat enterprise linux eus= 5.4nvdUScpe:2.3:o:redhat:enterprise_linux_eus:*:*:*:*:*:*:*:*
redhat enterprise linux server= 5.0nvdUScpe:2.3:o:redhat:enterprise_linux_server:*:*:*:*:*:*:*:*
redhat enterprise linux workstation= 5.0nvdUScpe:2.3:o:redhat:enterprise_linux_workstation:*:*:*:*:*:*:*:*
redhat virtualization= 5.0nvdUScpe:2.3:a:redhat:virtualization:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd NVD CVE.org MITRE

published 2010-01-27modified 2026-06-16

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+1364 more

references (24)

External citations — patches, advisories, analysis.

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