[USN-7931-3] Linux kernel (Real-time) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7931-3
December 15, 2025

linux-realtime, linux-realtime-6.8 vulnerabilities
==========================================================================

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)

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

Package Information:
https://launchpad.net/ubuntu/+source/linux-realtime/6.8.1-1039.40

https://launchpad.net/ubuntu/+source/linux-realtime-6.8/6.8.1-1039.40~22.04.1