CVE-2016-9120 on Ubuntu 16.04 LTS (xenial) - medium.
Description:
Race condition in the ion_ioctl function in drivers/staging/android/ion/ion.c in the Linux kernel before 4.6 allows local users to gain privileges or cause a denial of service (use-after-free) by calling ION_IOC_FREE on two CPUs at the same time. It was discovered that a race condition leading to a use-after-free existed in the ION driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.