In BlueZ 5.42, a use-after-free was identified in "conf_opt" function in "tools/parser/l2cap.c" source file. This issue can be triggered by processing a corrupted dump file and will result in hcidump crash.
http://www.securityfocus.com/bid/94652
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00072.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00071.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00069.html