drivers/hid/hid-sensor-hub.c in the Human Interface Device (HID) subsystem in the Linux kernel through 3.11, when CONFIG_HID_SENSOR_HUB is enabled, allows physically proximate attackers to obtain sensitive information from kernel memory via a crafted device.
http://www.ubuntu.com/usn/USN-1998-1
http://www.ubuntu.com/usn/USN-1995-1