The apparmor_setprocattr function in security/apparmor/lsm.c in the Linux kernel before 4.6.5 does not validate the buffer size, which allows local users to gain privileges by triggering an AppArmor setprocattr hook.
https://github.com/torvalds/linux/commit/30a46a4647fd1df9cf52e43bf467f0d9265096ca
https://bugzilla.redhat.com/show_bug.cgi?id=1354383
http://www.securityfocus.com/bid/91696
http://www.openwall.com/lists/oss-security/2016/07/09/2
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.5