It indicates a buffer overflow attempt is made against Samba server.
Samba is an Open Source/Free Software suite that provides seamless file and
print services to SMB/CIFS clients. Samba-TNG was originally a fork off of
the Samba source tree, and aims at being a substitute for a Windows NT domain
There exists a vulnerability in some versions of Samba that allows attackers to execute arbitrary code by sending specially crafted request that causes buffer overflow in the call_trans2open function.
Samba Samba 2.2.8 - Samba Samba 2.2.2
Attackers can gain remote root access and execute arbitrary code on the victim system.