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Fencer Intel
medium 5.0

CVE-2012-4444 json

The ip6_frag_queue function in net/ipv6/reassembly.c in the Linux kernel before 2.6.36 allows remote attackers to bypass intended network r…

published 2012-12-21 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4377

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The ip6_frag_queue function in net/ipv6/reassembly.c in the Linux kernel before 2.6.36 allows remote attackers to bypass intended network restrictions via overlapping IPv6 fragments.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 2.6.36-1~experimental.1

debian advisories DEBIAN-CVE-2012-4444

  • kernel RHEL 5 2.6.18-348.1.1.el5
  • kernel-PAE RHEL 5 2.6.18-348.1.1.el5
  • kernel-xen RHEL 5 2.6.18-348.1.1.el5
  • kernel-kdump RHEL 5 2.6.18-348.1.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-348.1.1.el5
  • kernel RHEL 6 2.6.32-279.19.1.el6
  • perf RHEL 6 2.6.32-279.19.1.el6
  • python-perf RHEL 6 2.6.32-279.19.1.el6

red hat advisories RHSA-2013:0168RHSA-2012:1580

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-2012-4444 updated cvss 2.6

kernel: net: acceptation of overlapping ipv6 fragments

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-348.1.1.el5, kernel-PAE 2.6.18-348.1.1.el5, kernel-xen 2.6.18-348.1.1.el5, kernel-kdump 2.6.18-348.1.1.el5, kernel-debuginfo-common 2.6.18-348.1.1.el5
    fixed: vendor fix RHSA-2013:0168
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-279.19.1.el6, kernel 2.6.32-279.19.1.el6, kernel-firmware 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) kernel 2.6.32-279.19.1.el6, python-perf 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6 Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-279.19.1.el6, kernel 2.6.32-279.19.1.el6, kernel-firmware 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel 2.6.32-279.19.1.el6, python-perf 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6 Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-279.19.1.el6, kernel 2.6.32-279.19.1.el6, kernel-kdump 2.6.32-279.19.1.el6, kernel-firmware 2.6.32-279.19.1.el6, kernel-bootwrapper 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, +3 more Red Hat Enterprise Linux Server Optional (v. 6) kernel 2.6.32-279.19.1.el6, python-perf 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, kernel-debuginfo-common-ppc64 2.6.32-279.19.1.el6, kernel-debuginfo-common-s390x 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-279.19.1.el6, kernel 2.6.32-279.19.1.el6, kernel-firmware 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) kernel 2.6.32-279.19.1.el6, python-perf 2.6.32-279.19.1.el6, kernel-debuginfo-common-i686 2.6.32-279.19.1.el6, kernel-debuginfo-common-x86_64 2.6.32-279.19.1.el6
    fixed: vendor fix RHSA-2012:1580
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

3.58% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Technology feeds

References

Sources

Fencer Intel 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.