The internal DNS server in Samba 4.x before 4.1.23, 4.2.x before 4.2.9, 4.3.x before 4.3.6, and 4.4.x before 4.4.0rc4, when an AD DC is configured, allows remote authenticated users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from process memory by uploading a crafted DNS TXT record.
https://www.samba.org/samba/security/CVE-2016-0771.html
https://bugzilla.samba.org/show_bug.cgi?id=11686
https://bugzilla.samba.org/show_bug.cgi?id=11128
http://www.ubuntu.com/usn/USN-2922-1
http://www.securitytracker.com/id/1035219
http://www.securityfocus.com/bid/84273
http://www.debian.org/security/2016/dsa-3514
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00063.html