An issue was discovered in the Arm Mali GPU Kernel Driver (Valhall r29p0 through r38p0). A non-privileged user can make improper GPU processing operations to gain access to already freed memory.
https://developer.arm.com/Arm%20Security%20Center/Mali%20GPU%20Driver%20Vulnerabilities
http://packetstormsecurity.com/files/168147/Arm-Mali-CSF-VMA-Split-Mishandling.html