The IPv6 mobility parser in tcpdump before 4.9.2 has a buffer over-read in print-mobility.c:mobility_opt_print().
https://support.apple.com/HT208221
https://security.gentoo.org/glsa/201709-23
https://github.com/the-tcpdump-group/tcpdump/commit/7d3aba9f06899d0128ef46e8a2fa143c6fad8f62
https://github.com/the-tcpdump-group/tcpdump/commit/2e1f6d9320afa83abc1ff716c7981fa504edadf2
https://access.redhat.com/errata/RHEA-2018:0705
http://www.tcpdump.org/tcpdump-changes.txt