Unspecified vulnerability in MySQL 5.0 before 5.0.92, 5.1 before 5.1.51, and 5.5 before 5.5.6 allows remote authenticated users to cause a denial of service (server crash) via vectors related to "materializing a derived table that required a temporary table for grouping" and "user variable assignments."
https://exchange.xforce.ibmcloud.com/vulnerabilities/64844
https://bugzilla.redhat.com/show_bug.cgi?id=640808
http://www.vupen.com/english/advisories/2011/0345
http://www.vupen.com/english/advisories/2011/0105
http://www.ubuntu.com/usn/USN-1397-1
http://www.ubuntu.com/usn/USN-1017-1
http://www.turbolinux.co.jp/security/2011/TLSA-2011-3j.txt
http://www.securityfocus.com/bid/43676
http://www.mandriva.com/security/advisories?name=MDVSA-2010:223
http://www.mandriva.com/security/advisories?name=MDVSA-2010:222
http://www.debian.org/security/2011/dsa-2143
http://support.apple.com/kb/HT4723
http://secunia.com/advisories/42875
http://lists.apple.com/archives/security-announce/2011//Jun/msg00000.html
http://dev.mysql.com/doc/refman/5.5/en/news-5-5-6.html
http://dev.mysql.com/doc/refman/5.1/en/news-5-1-51.html