Ubuntu has released important security updates addressing vulnerabilities in OpenJDK 24, OpenJDK 21, and the Linux kernel. These updates are crucial for users running Ubuntu 25.04 and various LTS versions (20.04, 22.04, and 24.04).

OpenJDK 24 Vulnerabilities

The update for OpenJDK 24 (USN-7669-1) was released on July 24, 2025, fixing several critical issues that could potentially allow attackers to execute arbitrary code or cause denial of service. Key vulnerabilities include:

- Memory Management Issues in 2D Component (CVE-2025-30749, CVE-2025-50106)
- TLS 1.3 Handshake Vulnerability in JSSE Component (CVE-2025-30754)
- Network Connection Management Flaw (CVE-2025-50059)

To mitigate these risks, users are advised to update to the latest package versions provided in the update.

OpenJDK 21 Vulnerabilities

Similarly, OpenJDK 21 (USN-7668-1) was also updated on the same date, addressing vulnerabilities that could lead to data breaches or service denials. Affected components are similar to those in OpenJDK 24, with the same primary vulnerabilities listed above.

Linux Kernel Vulnerabilities

An additional security notice (USN-7671-1) was issued on July 25, 2025, concerning vulnerabilities in the Linux kernel affecting Ubuntu 20.04 and 18.04 LTS. The update addresses numerous security flaws in various subsystems including:

- ACPI drivers
- GPU drivers
- SMB network file system
- Memory management
- Netfilter
- Network traffic control

With these vulnerabilities, attackers could potentially compromise the system. Users are urged to update their kernel to the latest versions as specified for their respective Ubuntu distributions.

Update Instructions

For all the updates, users are advised to perform a standard system update and restart their systems, particularly for Java applications to apply the changes effectively. Notably, the kernel update necessitates recompilation and reinstallation of any third-party kernel modules due to an ABI change.

Conclusion

These updates highlight the ongoing commitment to security within the Ubuntu ecosystem. Users should prioritize applying these updates promptly to safeguard their systems against potential threats. For further details and package information, users can refer to the respective security notices linked in each update.

Recommendations for Users

- Regularly check for security updates and apply them.
- Ensure backups are up-to-date before applying significant updates.
- Monitor official Ubuntu channels for ongoing security advisories

OpenJDK and Kernel updates for Ubuntu

Ubuntu Linux has been updated with security patches for OpenJDK 24 and 21 vulnerabilities, as well as Linux kernel vulnerabilities:

[USN-7669-1] OpenJDK 24 vulnerabilities
[USN-7668-1] OpenJDK 21 vulnerabilities
[USN-7671-1] Linux kernel vulnerabilities

OpenJDK and Kernel updates for Ubuntu @ Linux Compatible