Ubuntu has published a security advisory, highlighting vulnerabilities in Linux Kernel for multiple products on the 18th of August 2021. It is recommended that you take the necessary precautions by ensuring your products are always updated.
For more information on these Ubuntu updates, you can follow these URLs:
https://ubuntu.com/security/notices?release=hirsute
https://ubuntu.com/security/notices?release=focal
https://ubuntu.com/security/notices?release=bionic
https://ubuntu.com/security/notices?release=xenial
https://ubuntu.com/security/notices?release=trusty
The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.
PDF Download: Ubuntu Releases Security Updates for Multiple Products.pdf
References
https://cyber.gc.ca/en/alerts/ubuntu-security-advisory-20