CVE-2009-4307 Information

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).

Reference

http://bugzilla.kernel.org/show_bug.cgi?id=14287 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=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/oval3Aorg.mitre.oval3Adef3A9874