CVE-2009-4307

Severity: high (CVSS 7.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2009-12-13 · updated 2026-06-16
Weakness: CWE-189

Description

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).

Affected products

Linux kernel: through 2.6.32; 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+325)

References

http://bugzilla.kernel.org/show_bug.cgi?id=14287
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html
http://lkml.org/lkml/2009/12/9/255
http://secunia.com/advisories/37658
http://secunia.com/advisories/38017
http://secunia.com/advisories/38276
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
http://www.redhat.com/support/errata/RHSA-2010-0380.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9874

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