AlertsUbuntu Security Advisory

Number: AV21-583
Date: 12 November 2021

On 11 November 2021 Ubuntu released Security Notices to address vulnerabilities in the Linux kernel affecting the following products:

  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 ESM

Exploitation of these vulnerabilities could expose sensitive information, cause a denial of service or the execution of arbitrary code.

The Cyber Centre encourages users and administrators to review the following web links and apply the necessary updates.

Ubuntu Security Notice (USN-5137-2)

Ubuntu Security Notice (USN-5139-1)

Ubuntu Security Notice (USN-5140-1)

Ubuntu Security Notice (LSN-0082-1)

Ubuntu Security Notices

Note to Readers

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.


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