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Fencer Intel
high 7.1

CVE-2012-2100 json

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms,…

published 2012-07-03 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-2104

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

Patch / fix

  • 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
  • kernel-kdump RHEL 6 2.6.32-279.19.1.el6
  • kernel-firmware RHEL 6 2.6.32-279.19.1.el6
  • kernel-bootwrapper RHEL 6 2.6.32-279.19.1.el6
  • kernel-debuginfo-common-i686 RHEL 6 2.6.32-279.19.1.el6
  • kernel-debuginfo-common-ppc64 RHEL 6 2.6.32-279.19.1.el6

red hat advisories RHSA-2012:1580RHSA-2012:1445

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-2012-2100 updated cvss 4.0

kernel: ext4: fix inconsistency in ext4_fill_flex_info()

  • Red Hat Enterprise Linux 4 kernel
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-308.20.1.el5, kernel-PAE 2.6.18-308.20.1.el5, kernel-xen 2.6.18-308.20.1.el5, kernel-kdump 2.6.18-308.20.1.el5, kernel-debuginfo-common 2.6.18-308.20.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-308.20.1.el5, kernel-PAE 2.6.18-308.20.1.el5, kernel-xen 2.6.18-308.20.1.el5, kernel-debuginfo-common 2.6.18-308.20.1.el5
    fixed: vendor fix RHSA-2012:1445
  • 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 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

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
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.