The OSPFv3 parser in tcpdump before 4.9.2 has a buffer over-read in print-ospf6.c:ospf6_decode_v3().
https://support.apple.com/HT208221
https://security.gentoo.org/glsa/201709-23
https://github.com/the-tcpdump-group/tcpdump/commit/88b2dac837e81cf56dce05e6e7b5989332c0092d
https://access.redhat.com/errata/RHEA-2018:0705
http://www.tcpdump.org/tcpdump-changes.txt