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.
Search USNs
USN ID, name, description or CVE ID contains
1 - 10 of 10108 results
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 22.04 LTS
CVE ID
CVE-2025-38227, CVE-2025-38678, CVE-2025-21729 + 1 other
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 25.10
CVE ID
CVE-2025-40026, CVE-2025-40028, CVE-2025-40027 + 3 others
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 22.04 LTS
CVE ID
CVE-2025-39964, CVE-2024-47691, CVE-2024-53090 + 6 others
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 22.04 LTS
CVE ID
CVE-2024-50067, CVE-2025-40018, CVE-2024-47691 + 6 others
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 22.04 LTS,
- 20.04 LTS
CVE ID
CVE-2025-21855, CVE-2022-49390, CVE-2024-47691 + 6 others
11 December 2025
Several security issues were fixed in the Linux kernel.
- Ubuntu 20.04 LTS
CVE ID
CVE-2025-39964, CVE-2024-47691, CVE-2025-38666 + 12 others
11 December 2025
Several security issues were fixed in urllib3.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS
CVE ID
11 December 2025
Several security issues were fixed in OpenStack Keystone.
- Ubuntu 22.04 LTS
CVE ID
11 December 2025
c-ares could be made to crash if it received specially crafted queries.
- Ubuntu 25.10 ,
- 25.04
CVE ID
11 December 2025
Several security issues were fixed in libpng.
- Ubuntu 25.10 ,
- 25.04 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
CVE-2025-64720, CVE-2025-64506, CVE-2025-64505 + 1 other
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