arch/arm64/kernel/perf_event.c in the Linux kernel before 4.1 on arm64 platforms allows local users to gain privileges or cause a denial of service (invalid pointer dereference) via vectors involving events that are mishandled during a span of multiple HW PMUs.
https://github.com/torvalds/linux/commit/8fff105e13041e49b82f92eef034f363a6b1c071
http://www.securityfocus.com/bid/93314