The mysqluninstallplugin function in sql/sqlplugin.cc in MySQL 5.1 before 5.1.46 does not check privileges before uninstalling a plugin, which allows remote attackers to uninstall arbitrary plugins via the UNINSTALL PLUGIN command.
MySQL before 5.1.46 allows local users to delete the data and index files of another user's MyISAM table via a symlink attack in conjunction with the DROP TABLE command, a different vulnerability than CVE-2008-4098 and CVE-2008-7247.