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Ubuntu 24.04 LTS: Linux Real-time Kernel Critical Flaws Update USN-7931-3

ubuntu
Calendar Grey December 15, 2025
Dist Ubuntu Esm H88
Multiple security issues in the Linux kernel for Ubuntu leading to potential system compromises due to vulnerabilities fixed.
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-realtime: Linux kernel for Real-time systems - linux-realtime-6.8: Linux kernel for Real-time systems Details: Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - Media drivers; - Memory management; - Appletalk network protocol; - Netfilter; (CVE-2025-37958, CVE-2025-38666, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018)

Topics%20covered

Topics Covered

security advisory security issue kernel update Ubuntu real time systems linux-realtime

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS linux-image-6.8.1-1039-realtime 6.8.1-1039.40 Available with Ubuntu Pro linux-image-realtime 6.8.1-1039.40 Available with Ubuntu Pro linux-image-realtime-6.8.1 6.8.1-1039.40 Available with Ubuntu Pro Ubuntu 22.04 LTS linux-image-6.8.1-1039-realtime 6.8.1-1039.40~22.04.1 Available with Ubuntu Pro linux-image-realtime-6.8.1 6.8.1-1039.40~22.04.1 Available with Ubuntu Pro linux-image-realtime-edge 6.8.1-1039.40~22.04.1 Available with Ubuntu Pro linux-image-realtime-hwe-22.04 6.8.1-1039.40~22.04.1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References

https://ubuntu.com/security/notices/USN-7931-3

https://ubuntu.com/security/notices/USN-7931-2

https://ubuntu.com/security/notices/USN-7931-1

CVE-2025-37958, CVE-2025-38666, CVE-2025-39964, CVE-2025-39993,

CVE-2025-40018

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7931-3

Topics%20covered

Topics Covered

security advisory security issue kernel update Ubuntu real time systems linux-realtime

Package Information

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