Race condition in the get_task_ioprio function in block/ioprio.c in the Linux kernel before 4.6.6 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted ioprio_get system call.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8ba8682107ee2ca3347354e018865d8e1967c5f4
source.android.com/security/bulletin/2016-11-01.html
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.6
www.securityfocus.com/bid/94135
github.com/torvalds/linux/commit/8ba8682107ee2ca3347354e018865d8e1967c5f4