In BlueZ 5.42, a buffer overflow was observed in "read_n" function in "tools/hcidump.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/95013
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00069.html