storage/innobase/dict/dict0crea.c in mysqld in Oracle MySQL 5.1 before 5.1.49 allows remote authenticated users to cause a denial of service (assertion failure) by modifying the (1) innodb_file_format or (2) innodb_file_per_table configuration parameters for the InnoDB storage engine, then executing a DDL statement.
https://exchange.xforce.ibmcloud.com/vulnerabilities/64689
http://www.vupen.com/english/advisories/2011/0133
http://www.securityfocus.com/bid/42643
http://www.mandriva.com/security/advisories?name=MDVSA-2011:012