A null pointer dereference flaw was found in the way samba checked database outputs from the LDB database layer. An authenticated attacker could use this flaw to crash a samba server in an Active Directory Domain Controller configuration. Samba versions before 4.7.9 and 4.8.4 are vulnerable.
https://www.samba.org/samba/security/CVE-2018-10918.html
https://usn.ubuntu.com/3738-1/
https://security.netapp.com/advisory/ntap-20180814-0001/
https://security.gentoo.org/glsa/202003-52