Unspecified vulnerability in the server optimizer subcomponent of the Oracle MySQL server could allow authenticated database users to cause a hang or frequently repeatable crash of the MySQL server via multiple protocols.
Upstream announced, supported MySQL server versions, vulnerable to this flaw:
5.1.61 and earlier and 5.5.21 and earlier
This issue has been addressed in following products:
Red Hat Enterprise Linux 6
Via RHSA-2012:1462 https://rhn.redhat.com/errata/RHSA-2012-1462.html