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-6640-1: shadow vulnerability

15 February 2024

shadow could be made to expose sensitive information.

  • Ubuntu 23.10 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-4641

USN-6629-1: UltraJSON vulnerabilities

14 February 2024

Several security issues were fixed in UltraJSON.

  • Ubuntu 22.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2022-31117, CVE-2022-31116, CVE-2021-45958

USN-6632-1: OpenSSL vulnerabilities

13 February 2024

Several security issues were fixed in OpenSSL.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-5678, CVE-2024-0727

USN-6627-1: libde265 vulnerabilities

8 February 2024

Several security issues were fixed in libde265.

  • Ubuntu 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2022-43242, CVE-2022-43243, CVE-2021-36409 + 15 others

LSN-0100-1: Kernel Live Patch Security Notice

7 February 2024

Several security issues were fixed in the kernel.

  • Ubuntu 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-6817, CVE-2023-6040, CVE-2023-6932 + 2 others

USN-6592-2: libssh vulnerabilities

5 February 2024

Several security issues were fixed in libssh.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-6918, CVE-2023-6004

USN-6621-1: ImageMagick vulnerability

1 February 2024

ImageMagick could be made to crash if it opened a specially crafted file.

  • Ubuntu 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-5341

USN-6587-4: X.Org X Server regression

1 February 2024

A regression was fixed in X.Org X Server.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

USN-6591-2: Postfix update

31 January 2024

Postfix could allow bypass of email authentication if it received specially crafted network traffic.

  • Ubuntu 23.10 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-51764

USN-6617-1: libde265 vulnerabilities

30 January 2024

Several security issues were fixed in libde265.

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

CVE ID

CVE-2020-21606, CVE-2021-36408, CVE-2020-21595 + 11 others

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