The override_release function in kernel/sys.c in the Linux kernel before 3.4.16 allows local users to obtain sensitive information from kernel stack memory via a uname system call in conjunction with a UNAME26 personality.
https://github.com/torvalds/linux/commit/2702b1526c7278c4d65d78de209a465d4de2885e
https://bugzilla.redhat.com/show_bug.cgi?id=862877
http://www.ubuntu.com/usn/USN-1652-1
http://www.ubuntu.com/usn/USN-1649-1
http://www.ubuntu.com/usn/USN-1648-1
http://www.ubuntu.com/usn/USN-1647-1
http://www.ubuntu.com/usn/USN-1646-1
http://www.ubuntu.com/usn/USN-1645-1
http://www.ubuntu.com/usn/USN-1644-1
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.16
http://secunia.com/advisories/51409
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091110.html