A MySQL regression update has been released for Ubuntu Linux 20.04 LTS.

USN-4441-2: MySQL regression

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Ubuntu Security Notice USN-4441-2
August 05, 2020

mysql-8.0 regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

USN-4441-1 introduced a regression in MySQL

Software Description:
- mysql-8.0: MySQL database

Details:

USN-4441-1 fixed vulnerabilities in MySQL. The new upstream version
changed compiler options and caused a regression in certain scenarios. This
update fixes the problem.

Original advisory details:

Multiple security issues were discovered in MySQL and this update includes
new upstream MySQL versions to fix these issues.
MySQL has been updated to 8.0.21 in Ubuntu 20.04 LTS. Ubuntu 16.04 LTS and
Ubuntu 18.04 LTS have been updated to MySQL 5.7.31.
In addition to security fixes, the updated packages contain bug fixes, new
features, and possibly incompatible changes.
Please see the following for more information:
  https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-31.html
  https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-21.html
  https://www.oracle.com/security-alerts/cpujul2020.html

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
mysql-server-8.0 8.0.21-0ubuntu0.20.04.4

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4441-2
  https://usn.ubuntu.com/4441-1
  https://launchpad.net/bugs/1889851

Package Information:
  https://launchpad.net/ubuntu/+source/mysql-8.0/8.0.21-0ubuntu0.20.04.4