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-6494-1: Linux kernel vulnerabilities

21 November 2023

Several security issues were fixed in the Linux kernel.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-5717, CVE-2023-39194, CVE-2023-39193 + 6 others

USN-6493-2: hibagent update

21 November 2023

A security improvement was added to hibagent.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

USN-6487-1: Avahi vulnerabilities

20 November 2023

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

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-38469, CVE-2023-38471, CVE-2023-38472 + 2 others

USN-6485-1: Intel Microcode vulnerability

17 November 2023

The system could be made to crash or expose sensitive information under certain conditions.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-23583

USN-6473-2: pip vulnerabilities

15 November 2023

Several security issues were fixed in pip.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-45803, CVE-2018-25091, CVE-2023-43804

USN-6478-1: Traceroute vulnerability

14 November 2023

Traceroute could be made to execute arbitrary commands.

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

CVE ID

CVE-2023-46316

USN-6477-1: procps-ng vulnerability

14 November 2023

procps-ng could be made to crash if it received specially crafted input.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-4016

USN-6475-1: Cobbler vulnerabilities

13 November 2023

Several security issues were fixed in Cobbler.

  • Ubuntu 16.04 LTS

CVE ID

CVE-2021-40323, CVE-2018-1000225, CVE-2021-45082 + 8 others

USN-6474-1: xrdp vulnerabilities

8 November 2023

Several security issues were fixed in xrdp.

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

CVE ID

CVE-2022-23468, CVE-2022-23477, CVE-2022-23479 + 10 others

USN-6473-1: urllib3 vulnerabilities

7 November 2023

Several security issues were fixed in urllib3.

  • Ubuntu 23.10 ,
  • 23.04 ,
  • 22.04 LTS,
  • 20.04 LTS,
  • 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-45803, CVE-2023-43804, CVE-2018-25091

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