This indicates an attack attempt to exploit a denial-of-service vulnerability in Oracle MySQL.
The vulnerability is caused by an error when the vulnerable software handles an SQL query with a malformed "with rollup" operator. As a result, a remote attacker can send a crafted query to crash the vulnerable system.
Oracle MySQL versions before 5.1.49
Denial of Service: Remote attackers can gain control of vulnerable systems.
Currently we are not aware of any patches supplied by the vendor for this issue.