The wanxl_ioctl function in drivers/net/wan/wanxl.c in the Linux kernel before 3.11.7 does not properly initialize a certain data structure, which allows local users to obtain sensitive information from kernel memory via an ioctl call.
https://github.com/torvalds/linux/commit/2b13d06c9584b4eb773f1e80bbaedab9a1c344e1
https://exchange.xforce.ibmcloud.com/vulnerabilities/90444
https://bugzilla.redhat.com/show_bug.cgi?id=1053613
http://www.ubuntu.com/usn/USN-2129-1
http://www.ubuntu.com/usn/USN-2128-1
http://www.securityfocus.com/bid/64953
http://www.openwall.com/lists/oss-security/2014/01/15/3
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.11.7