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-6611-1: Exim vulnerability

29 January 2024

Exim could be made to bypass an SPF protection mechanism if it received a specially crafted request.

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

CVE ID

CVE-2023-51766

USN-6604-1: Linux kernel vulnerabilities

25 January 2024

Several security issues were fixed in the Linux kernel.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-20588, CVE-2023-1079, CVE-2023-45863 + 3 others

USN-6603-1: Linux kernel (AWS) vulnerabilities

25 January 2024

Several security issues were fixed in the Linux kernel.

  • Ubuntu 16.04 LTS

CVE ID

CVE-2023-6606, CVE-2023-6931, CVE-2023-6932

USN-6602-1: Linux kernel vulnerabilities

25 January 2024

Several security issues were fixed in the Linux kernel.

  • Ubuntu 16.04 LTS,
  • 14.04 LTS

CVE ID

CVE-2023-20588, CVE-2023-45863, CVE-2023-6606 + 2 others

USN-6599-1: Jinja2 vulnerabilities

25 January 2024

Several security issues were fixed in jinja2.

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

CVE ID

CVE-2020-28493, CVE-2024-22195

USN-6596-1: Apache::Session::LDAP vulnerability

24 January 2024

Apache::Session::LDAP could be made to expose sensitive information through spoofing if it received invalid X.509 certificate.

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

CVE ID

CVE-2020-36658

USN-6587-2: X.Org X Server vulnerabilities

22 January 2024

Several security issues were fixed in X.Org X Server.

  • Ubuntu 18.04 LTS,
  • 16.04 LTS

CVE ID

CVE-2023-6816, CVE-2024-0408, CVE-2024-0229 + 3 others

USN-6591-1: Postfix vulnerability

22 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-6590-1: Xerces-C++ vulnerabilities

18 January 2024

Several security issues were fixed in Xerces-C++.

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

CVE ID

CVE-2018-1311, CVE-2023-37536

USN-6559-1: ZooKeeper vulnerabilities

16 January 2024

Several security issues were fixed in ZooKeeper.

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

CVE ID

CVE-2023-44981, CVE-2019-0201

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