Ubuntu 24.04 LTS: USN-7889-4 Linux Kernel Critical Flaws Fixed

ubuntu

December 4, 2025

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems

- linux-gcp-6.8: Linux kernel for Google Cloud Platform (GCP) 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:

- Media drivers;

- Network drivers;

- Netfilter;

- TLS protocol;

(CVE-2025-21729, CVE-2025-38227, CVE-2025-38616, CVE-2025-38678)

Topics Covered

security advisory critical Ubuntu kernel linux-gke linux-gcp

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  linux-image-6.8.0-1027-gkeop    6.8.0-1027.30
  linux-image-6.8.0-1040-gke      6.8.0-1040.45
  linux-image-6.8.0-1040-gke-64k  6.8.0-1040.45
  linux-image-6.8.0-1044-gcp      6.8.0-1044.47
  linux-image-6.8.0-1044-gcp-64k  6.8.0-1044.47
  linux-image-gcp-6.8             6.8.0-1044.47
  linux-image-gcp-64k-6.8         6.8.0-1044.47
  linux-image-gcp-64k-lts-24.04   6.8.0-1044.47
  linux-image-gcp-lts-24.04       6.8.0-1044.47
  linux-image-gke                 6.8.0-1040.45
  linux-image-gke-6.8             6.8.0-1040.45
  linux-image-gke-64k             6.8.0-1040.45
  linux-image-gke-64k-6.8         6.8.0-1040.45
  linux-image-gkeop               6.8.0-1027.30
  linux-image-gkeop-6.8           6.8.0-1027.30

Ubuntu 22.04 LTS
  linux-image-6.8.0-1044-gcp      6.8.0-1044.47~22.04.1
  linux-image-6.8.0-1044-gcp-64k  6.8.0-1044.47~22.04.1
  linux-image-gcp                 6.8.0-1044.47~22.04.1
  linux-image-gcp-6.8             6.8.0-1044.47~22.04.1
  linux-image-gcp-64k             6.8.0-1044.47~22.04.1
  linux-image-gcp-64k-6.8         6.8.0-1044.47~22.04.1

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.