CVE-2012-2100

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Summary

CVECVE-2012-2100
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2012-07-03 16:40:32 UTC
Updated2026-04-29 01:13:23 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v2.0 7.1 from [email protected]

AV:N/AC:M/Au:N/C:N/I:N/A:C

Problem Types: CWE-189 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

AV:N/AC:M/Au:N/C:N/I:N/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel 3.2 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
ext4: fix undefined behavior in ext4_fill_flex_info() · torvalds/linux@d50f2ab · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2 af854a3a-2127-422b-91ae-364da2661108 www.kernel.org
git.kernel.org af854a3a-2127-422b-91ae-364da2661108 git.kernel.org
Linux Kernel EXT4 'ext4_fill_flex_info()' Local Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
oss-security - Re: fix to CVE-2009-4307 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
809687 – (CVE-2012-2100) CVE-2012-2100 kernel: ext4: fix inconsistency in ext4_fill_flex_info() af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com
kernel/git/torvalds/linux.git - Linux kernel source tree MITRE git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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