Race condition in the smb_send_rqst function in fs/cifs/transport.c in the Linux kernel before 3.7.2 allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via vectors involving a reconnection event.
https://github.com/torvalds/linux/commit/ea702b80e0bbb2448e201472127288beb82ca2fe
https://bugzilla.redhat.com/show_bug.cgi?id=952260
http://www.securityfocus.com/bid/59064
http://www.openwall.com/lists/oss-security/2013/04/15/2