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CVE-2012-2100

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86...

7.1 HighFix available

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.

Exploit likelihood

2.70%Up 1.3 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.1

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.

Record
CVE-2012-2100
CVSS 2.0
7.1 HighAV:N/AC:M/Au:N/C:N/I:N/A:C
Weakness
CWE-189
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2012-2100
Updated
2026-11-02
EUVDEUVD-2012-2104 No score

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.

Record
EUVD-2012-2104
Updated
2026-11-03
GitHub AdvisoriesGHSA-cx5x-f2xm-m2cr No score

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86...

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.

Record
GHSA-cx5x-f2xm-m2cr
Updated
2026-11-02
OSVBELL-CVE-2012-2100 7.1

CVE-2012-2100 does not affect BellSoft software

Record
BELL-CVE-2012-2100
CVSS 2.0
7.1 HighAV:N/AC:M/Au:N/C:N/I:N/A:C
Updated
2026-11-02
OSVUBUNTU-CVE-2012-2100 No score

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.

Record
UBUNTU-CVE-2012-2100
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
kernel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
Show 88 moreShow less
Affected packages
PackageAffectedFixed
kernel-doc
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-headers
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::client
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-doc
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-headers
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-kdump
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-kdump-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-kdump-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::server
 before 0:2.6.18-308.20.1.el5
0:2.6.18-308.20.1.el5
kernel
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-devel
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-i686
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-devel
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-doc
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-firmware
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-headers
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf-debuginfo
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf
Red Hat:enterprise_linux:6::client
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-devel
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-devel
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-doc
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-firmware
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-headers
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf-debuginfo
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf
Red Hat:enterprise_linux:6::computenode
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-bootwrapper
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-i686
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-ppc64
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-s390x
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-doc
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-firmware
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-headers
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-kdump
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-kdump-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-kdump-devel
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf-debuginfo
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf
Red Hat:enterprise_linux:6::server
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debug-devel
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-i686
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-debuginfo-common-x86_64
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-devel
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-doc
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-firmware
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
kernel-headers
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
perf-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf-debuginfo
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6
python-perf
Red Hat:enterprise_linux:6::workstation
 before 0:2.6.32-279.19.1.el6
0:2.6.32-279.19.1.el6

History

History
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-2100 is a high vulnerability (CVSS 7.1) in Linux Kernel, published April 12, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.70%, the 85th percentile. Fixed in kernel 0:2.6.18-308.20.1.el5.

References

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