CVE-2018-6925: NULL Pointer Dereference

In FreeBSD before 11.2-STABLEr338986, 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLEr338985, and 10.4-RELEASE-p13, due to improper maintenance of IPv6 protocol control block flags through various failure paths, an unprivileged authenticated local user may be able to cause a NULL pointer dereferen...