kernel: ext4: fix inconsistency in ext4_fill_flex_info()
Published Jul 3, 2012
7.1
HIGHCVSS 2.0
EPSS 2.70%
Description
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.
Affected products
No data.
- ≤ 3.2.1
- 3.2
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-308.20.1.el5
Fixed · RHSA-2012:1445
Red Hat Enterprise Linux 6
kernel-0:2.6.32-279.19.1.el6
Fixed · RHSA-2012:1580
Red Hat Enterprise Linux 4
kernel
Will not fix
Red Hat Enterprise MRG 2
realtime-kernel
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-308.20.1.el5 | Fixed | RHSA-2012:1445 |
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-279.19.1.el6 | Fixed | RHSA-2012:1580 |
| Red Hat Enterprise Linux 4 | kernel | Will not fix | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.70% (0.02701) | 85.41th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.68% (0.02678) | 83.80th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.00% (0.00997) | 75.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.64% (0.01644) | 88.07th | v3 (v2023.03.01) |
| Feb 1, 2024 | 1.64% (0.01644) | 86.28th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.79% (0.01794) | 86.18th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.41% (0.01408) | 72.37th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.96% (0.01955) | 77.90th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
References (11)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b x_refsource_CONFIRM
- http://rhn.redhat.com/errata/RHSA-2012-1445.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2012-1580.html vendor-advisoryx_refsource_REDHAT
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2012/04/12/11 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/53414 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2012-2100 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=809687 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/d50f2ab6f050311dbf7b8f5501b25f0bf64a439b x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2012-2100
- https://www.cve.org/CVERecord?id=CVE-2012-2100
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d50f2ab6f050311dbf7b8f5501b25f0bf64a439b | x_refsource_CONFIRM | |
| http://rhn.redhat.com/errata/RHSA-2012-1445.html | vendor-advisoryx_refsource_REDHAT | |
| http://rhn.redhat.com/errata/RHSA-2012-1580.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2 | x_refsource_CONFIRM | |
| http://www.openwall.com/lists/oss-security/2012/04/12/11 | mailing-listx_refsource_MLIST | |
| http://www.securityfocus.com/bid/53414 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2012-2100 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=809687 | x_refsource_CONFIRMIssue Tracking | |
| https://github.com/torvalds/linux/commit/d50f2ab6f050311dbf7b8f5501b25f0bf64a439b | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2012-2100 | ||
| https://www.cve.org/CVERecord?id=CVE-2012-2100 |
Change history (0)
No recorded changes yet.