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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8 December 2021

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

  • Ubuntu 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-3756


8 December 2021

BlueZ could be made to crash or run programs if it received specially crafted traffic.

  • Ubuntu 18.04 LTS

CVE ID

CVE-2019-8922


7 December 2021

A system hardening measure could be bypassed.

  • Ubuntu 18.04 LTS

7 December 2021

Several security issues were fixed in BusyBox.

  • Ubuntu 21.10 ,
  • 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

6 December 2021

Several security issues were fixed in Samba.

  • Ubuntu 18.04 LTS

6 December 2021

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

  • Ubuntu 18.04 LTS

6 December 2021

Several security issues were fixed in uriparser.

  • Ubuntu 18.04 LTS

6 December 2021

Several security issues were fixed in Long Range ZIP.

  • Ubuntu 18.04 LTS

1 December 2021

NSS could be made to crash or run programs if it verified a specially crafted signature.

  • Ubuntu 21.10 ,
  • 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS

1 December 2021

Thunderbird could be made to crash or run programs if it verified a specially crafted signature.

  • Ubuntu 21.10 ,
  • 21.04 ,
  • 20.04 LTS,
  • 18.04 LTS


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