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
3 - 12 of 1037 results
23 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS,
- 22.04 LTS
CVE ID
CVE-2025-68801, CVE-2025-40325, CVE-2025-68758 + 171 others
23 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 25.10 ,
- 24.04 LTS
CVE ID
CVE-2025-68801, CVE-2025-71099, CVE-2025-71071 + 135 others
22 April 2026
Several security issues were fixed in Tornado.
- Ubuntu 25.10 ,
- 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
21 April 2026
Several security issues were fixed in league/commonmark.
- Ubuntu 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS
CVE ID
21 April 2026
Apache Commons IO could be made to crash if it received specially crafted input.
- Ubuntu 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS,
- 14.04 LTS
CVE ID
20 April 2026
RapidJSON could be made to crash or run programs as an administrator if it opened a specially crafted file.
- Ubuntu 24.04 LTS,
- 22.04 LTS,
- 20.04 LTS,
- 18.04 LTS,
- 16.04 LTS
CVE ID
17 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS,
- 22.04 LTS
CVE ID
CVE-2025-68788, CVE-2025-68744, CVE-2025-68774 + 170 others
17 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS
CVE ID
CVE-2025-68788, CVE-2025-68744, CVE-2025-68774 + 171 others
17 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 24.04 LTS,
- 22.04 LTS
CVE ID
CVE-2025-71132, CVE-2026-23209, CVE-2025-71118 + 172 others
17 April 2026
Several security issues were fixed in the Linux kernel.
- Ubuntu 25.10 ,
- 24.04 LTS
CVE ID
CVE-2025-68736, CVE-2025-71099, CVE-2025-68788 + 135 others
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