The fragment_add_work function in epan/reassemble.c in the packet-reassembly feature in Wireshark 1.12.x before 1.12.5 does not properly determine the defragmentation state in a case of an insufficient snapshot length, which allows remote attackers to cause a denial of service (memory consumption) via a crafted packet.
http://rhn.redhat.com/errata/RHSA-2017-0631.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11129
https://security.gentoo.org/glsa/201510-03
http://www.debian.org/security/2015/dsa-3277
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html