A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.
The product dereferences a pointer that it expects to be valid but is NULL.