The Rx parser in tcpdump before 4.9.3 has a buffer over-read in print-rx.c:rx_cache_find() and rx_cache_insert().
4.9.3-0ubuntu0.16.04.14.9.3-0ubuntu0.18.04.14.9.3-0ubuntu0.14.04.1+esm1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H