Vulnerability Details : 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 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.
Vulnerability category: Denial of service
Products affected by CVE-2012-2100
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:x86:*
- cpe:2.3:o:linux:linux_kernel:3.2:*:*:*:*:*:x86:*
Exploit prediction scoring system (EPSS) score for CVE-2012-2100
1.64%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 86 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2012-2100
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.1
|
HIGH | AV:N/AC:M/Au:N/C:N/I:N/A:C |
8.6
|
6.9
|
NIST |
CWE ids for CVE-2012-2100
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2012-2100
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http://www.securityfocus.com/bid/53414
Linux Kernel EXT4 'ext4_fill_flex_info()' Local Denial of Service Vulnerability
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https://bugzilla.redhat.com/show_bug.cgi?id=809687
809687 – (CVE-2012-2100) CVE-2012-2100 kernel: ext4: fix inconsistency in ext4_fill_flex_info()
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http://rhn.redhat.com/errata/RHSA-2012-1580.html
RHSA-2012:1580 - Security Advisory - Red Hat Customer Portal
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http://rhn.redhat.com/errata/RHSA-2012-1445.html
RHSA-2012:1445 - Security Advisory - Red Hat Customer Portal
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http://www.openwall.com/lists/oss-security/2012/04/12/11
oss-security - Re: fix to CVE-2009-4307
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http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2
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http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b
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https://github.com/torvalds/linux/commit/d50f2ab6f050311dbf7b8f5501b25f0bf64a439b
ext4: fix undefined behavior in ext4_fill_flex_info() · torvalds/linux@d50f2ab · GitHub
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