CVE-2009-4307 json
The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a…
published 2009-12-13 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-4275
- cvss
- 7.1
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.4%
- EPSS 3.4% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service (divide-by-zero error and panic) via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value).
Patch / fix
- kernel RHEL 5 2.6.18-194.el5
- kernel-PAE RHEL 5 2.6.18-194.el5
- kernel-xen RHEL 5 2.6.18-194.el5
- kernel-kdump RHEL 5 2.6.18-194.el5
- kernel-debuginfo-common RHEL 5 2.6.18-194.el5
- kernel RHEL 5.4 EUS 2.6.18-164.17.1.el5
- kernel-PAE RHEL 5.4 EUS 2.6.18-164.17.1.el5
- kernel-xen RHEL 5.4 EUS 2.6.18-164.17.1.el5
red hat advisories RHSA-2010:0380RHSA-2010:0178
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-2009-4307 updated cvss 4.9
kernel: ext4: avoid divide by zero when trying to mount a corrupted file system
-
Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-194.el5, kernel-PAE 2.6.18-194.el5, kernel-xen 2.6.18-194.el5, kernel-kdump 2.6.18-194.el5, kernel-debuginfo-common 2.6.18-194.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-194.el5, kernel-PAE 2.6.18-194.el5, kernel-xen 2.6.18-194.el5, kernel-kdump 2.6.18-194.el5, kernel-debuginfo-common 2.6.18-194.el5fixed: vendor fix RHSA-2010:0178
-
Red Hat Enterprise Linux EUS (v. 5.4 server) kernel 2.6.18-164.17.1.el5, kernel-PAE 2.6.18-164.17.1.el5, kernel-xen 2.6.18-164.17.1.el5, kernel-kdump 2.6.18-164.17.1.el5, kernel-debuginfo-common 2.6.18-164.17.1.el5fixed: vendor fix RHSA-2010:0380
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
3.43% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- bugzilla.kernel.org http://bugzilla.kernel.org/show_bug.cgi?id=14287 referenced PoC, tagged "exploit" by a source, unverified
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
-
- CWE-189 Numeric Errors
- Technology feeds
References
-
kernel.org
/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
patch
-
bugzilla.kernel.org
/show_bug.cgi?id=14287
exploit, patch
-
redhat.com
/support/errata/RHSA-2010-0380.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2010-01/msg00000.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2010-01/msg00005.html
vendor-advisory
-
mandriva.com
/security/advisories?name=MDVSA-2011:029
vendor-advisory
-
secunia.com
/advisories/37658
third-party-advisory, vendor-advisory
-
secunia.com
/advisories/38276
third-party-advisory
- git.kernel.org /?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
-
lkml.org
/lkml/2009/12/9/255
mailing-list
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9874
vdb-entry, signature
-
secunia.com
/advisories/38017
third-party-advisory
Sources
- CVE List CVE-2009-4307
- NVD CVE-2009-4307
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