Bug 388335 (CVE-2011-3638)

Summary:	Kernel: ext4 Extent Splitting DoS (CVE-2011-3638)
Product:	Gentoo Security	Reporter:	Agostino Sarubbo <ago>
Component:	Kernel	Assignee:	Gentoo Kernel Security <security-kernel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kernel
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://secunia.com/advisories/46489/
Whiteboard:
Package list:		Runtime testing required:	---

Description Agostino Sarubbo gentoo-dev

2011-10-24 13:42:43 UTC

From secunia security advisory at $URL:

Description:
An error within the implementation of the ext4 file system when splitting extents can be exploited to cause a "BUG_ON()".

The vulnerability is reported in version 2.6.39.4. Other versions may also be affected.


Solution:
Fixed in the GIT repository.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=667eff35a1f56fa74ce98a0c7c29a40adc1ba4e3

Comment 1 GLSAMaker/CVETool Bot gentoo-dev

2013-03-04 21:50:23 UTC

CVE-2011-3638 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-3638):
  fs/ext4/extents.c in the Linux kernel before 3.0 does not mark a modified
  extent as dirty in certain cases of extent splitting, which allows local
  users to cause a denial of service (system crash) via vectors involving ext4
  umount and mount operations.

Comment 2 Aaron Bauman (RETIRED) gentoo-dev

2018-04-04 17:42:44 UTC

There are no longer any 2.x kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.