The llc_ui_getname function in net/llc/af_llc.c in the Linux kernel before 3.6 has an incorrect return value in certain circumstances, which allows local users to obtain sensitive information from kernel stack memory via a crafted application that leverages an uninitialized pointer argument.
http://rhn.redhat.com/errata/RHSA-2013-1645.html
http://www.openwall.com/lists/oss-security/2013/03/05/13
http://www.ubuntu.com/usn/USN-1805-1
http://www.ubuntu.com/usn/USN-1808-1
https://github.com/torvalds/linux/commit/3592aaeb80290bda0f2cf0b5456c97bfc638b192