Ubuntu has published a security advisory, highlighting vulnerabilities in Linux Kernel for multiple products on the 24th of August 2021. It is recommended that you take the necessary precautions by ensuring your products are always updated.
For more of these updates, you can follow these URLs:
https://ubuntu.com/security/notices?release=bionic
https://ubuntu.com/security/notices?release=focal
https://ubuntu.com/security/notices?release=hirsute
The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.
PDF Download: Ubuntu Security Advisory.pdf
References
https://cyber.gc.ca/en/alerts/ubuntu-security-advisory-21