Linux kernel built with the Common Internet File System (CONFIG_CIFS) support along with a feature to access Distributed File Systems (CONFIG_CIFS_DFS_UPCALL), is vulnerable to a memory corruption flaw caused by writing one byte past an allocated memory area. It occurs while mounting a DFS share wherein the server provides DFS referral names of certain length. The memory corruption leads to an unresponsive kernel and subsequent crash resulting in Denial of Service.

An user/program able to mount a file system could use this flaw to crash the kernel resulting in DoS.

Upstream fix:
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 -> https://git.kernel.org/linus/1fc29bacedeabb278080e31bb9c1ecb49f143c3b

Reference:
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 -> http://www.openwall.com/lists/oss-security/2013/08/14/8