The IPv6 stack in the Linux kernel before 4.3.3 mishandles options data, which allows local users to gain privileges or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call.
http://www.securityfocus.com/bid/92227
http://rhn.redhat.com/errata/RHSA-2016-2695.html
http://rhn.redhat.com/errata/RHSA-2016-2584.html