On April 25, Canonical published details about MySQL vulnerabilities for its Ubuntu 13.04 (Raring Ringtail) operating systems.
According to Canonical, several security issues have been fixed in MySQL and this update includes new upstream MySQL versions to fix these issues.
MySQL has been updated to 5.1.69 in Ubuntu 10.04 LTS and Ubuntu 11.10. Ubuntu 12.04 LTS and Ubuntu 12.10 have been updated to MySQL 5.5.31.
For a more detailed description of the security problems in question and of the MySQL vulnerabilities, you can visit Canonical's security notification.
Users can simply fix the security flaws by upgrading the operating systems to the latest mysql-server package, specific to each distribution.
A normal system update, executed with the Update Manager, will implement all the necessary changes. A complete system restart is not necessary.