FreeBSD Security Advisory - The SIOCSIFINFO_IN6 ioctl is missing a necessary permissions check. Local users, including non-root users and users inside jails, can set some IPv6 interface properties. These include changing the link MTU and disabling interfaces entirely.
ac68c0baaefa4bfdc7df1c0fa45bed659499c7dbaf9c342aee6ff1990c40e4a0