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TITLE:
Linux Kernel Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA33977

VERIFY ADVISORY:
http://secunia.com/advisories/33977/

DESCRIPTION:
Some vulnerabilities have been reported in the Linux Kernel, which
potentially can be exploited by malicious, local users to cause a DoS
(Denial of Service).

1) A vulnerability is caused due to an error within the
"make_indexed_dir()" function in fs/ext4/namei.c, which can be
exploited to e.g. crash a system via specially crafted Ext4 file
systems.

2) A vulnerability is caused due to an error within the
"ext4_fill_super()" function in fs/ext4/super.c, which can be
exploited to e.g. crash a system via Ext4 file systems containing
specially crafted superblock configurations.

SOLUTION:
Update to version 2.6.27.19 or 2.6.28.7.

PROVIDED AND/OR DISCOVERED BY:
1) Sami Liedes
2) Independently discovered by David Maciejak (Fortinet's FortiGuard
Global Security Research Team) and Thiemo Nagel

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7

1) http://bugzilla.kernel.org/show_bug.cgi?id=12430
2) http://bugzilla.kernel.org/show_bug.cgi?id=12371

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