Ubuntu Security Notices

Developers issue an Ubuntu Security Notice when a security issue is fixed in an official Ubuntu package. You can find additional guidance for high-profile vulnerabilities in the Ubuntu Vulnerability Knowledge Base section.

To report a security vulnerability in an Ubuntu package, please contact the Security Team.

The Security Team also produces OVAL files for each Ubuntu release. These are an industry-standard machine-readable format dataset that contain details of all known security vulnerabilities and fixes relevant to the Ubuntu release, and can be used to determine whether a particular patch is appropriate. OVAL files can also be used to audit a system to check whether the latest security fixes have been applied.

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USN-5104-1: Squid vulnerability

5 October 2021

Squid could be made to crash or expose sensitive information over the network.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-28116

USN-5103-1: docker.io vulnerability

4 October 2021

Docker could be made to adjust the permissions of files.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2021-41089

USN-5100-1: containerd vulnerability

4 October 2021

containerd would allow unintended access to files.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-41103

USN-5097-1: LedgerSMB vulnerabilities

30 September 2021

ledgersmb could be made to crash if it received specially crafted input.

  • Ubuntu 21.04 ,
  • 20.04 LTS

CVE ID

CVE-2021-3693, CVE-2021-3694, CVE-2021-3731

USN-5092-2: Linux kernel vulnerabilities

29 September 2021

Several security issues were fixed in the Linux kernel.

  • Ubuntu 21.04 ,
  • 20.04 LTS

CVE ID

CVE-2021-41073, CVE-2021-38160, CVE-2021-35477 + 9 others

USN-5090-3: Apache HTTP Server regression

28 September 2021

USN-5090-1 introduced a regression in Apache HTTP Server.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

USN-5093-1: Vim vulnerabilities

28 September 2021

Several security issues were fixed in Vim.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2021-3796, CVE-2021-3778, CVE-2021-3770

USN-5092-1: Linux kernel vulnerabilities

28 September 2021

Several security issues were fixed in the Linux kernel.

  • Ubuntu 21.04 ,
  • 20.04 LTS

CVE ID

CVE-2021-41073, CVE-2021-37576, CVE-2021-38204 + 9 others

USN-5090-1: Apache HTTP Server vulnerabilities

27 September 2021

Several security issues were fixed in Apache HTTP Server.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-34798, CVE-2021-33193, CVE-2021-40438 + 2 others

USN-5089-1: ca-certificates update

23 September 2021

A certificate about to expire was removed from ca-certificates.

  • Ubuntu 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS
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