The Linux kernel through 3.7.9 allows local users to obtain sensitive information about keystroke timing by using the inotify API on the /dev/ptmx device.
lists.opensuse.org/opensuse-security-announce/2013-03/msg00004.html
lists.opensuse.org/opensuse-security-announce/2013-04/msg00018.html
lists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html
lists.opensuse.org/opensuse-security-announce/2013-07/msg00016.html
lists.opensuse.org/opensuse-security-announce/2013-07/msg00018.html
www.openwall.com/lists/oss-security/2013/01/08/3
www.ubuntu.com/usn/USN-2128-1
www.ubuntu.com/usn/USN-2129-1
bugzilla.redhat.com/show_bug.cgi?id=892983