Ubuntu 25.10: Linux Kernel Critical Update System Threat CVE-2025-40018

ubuntu

December 10, 2025

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

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

- linux-realtime: 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:

- Tracing infrastructure;

- Netfilter;

(CVE-2025-40018, CVE-2025-40232)

Topics Covered

security advisory Ubuntu Linux update system compromise Linux kernel aws gcp kernel

Update Instructions

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

Ubuntu 25.10
   linux-image-6.17.0-1004-realtime  6.17.0-1004.5
   linux-image-6.17.0-1005-aws     6.17.0-1005.5
   linux-image-6.17.0-1005-aws-64k  6.17.0-1005.5
   linux-image-6.17.0-1005-gcp     6.17.0-1005.5
   linux-image-6.17.0-1005-gcp-64k  6.17.0-1005.5
   linux-image-6.17.0-8-generic    6.17.0-8.8
   linux-image-6.17.0-8-generic-64k  6.17.0-8.8
   linux-image-aws                 6.17.0-1005.5
   linux-image-aws-6.17            6.17.0-1005.5
   linux-image-aws-64k             6.17.0-1005.5
   linux-image-aws-64k-6.17        6.17.0-1005.5
   linux-image-gcp                 6.17.0-1005.5
   linux-image-gcp-6.17            6.17.0-1005.5
   linux-image-gcp-64k             6.17.0-1005.5
   linux-image-gcp-64k-6.17        6.17.0-1005.5
   linux-image-generic             6.17.0-8.8
   linux-image-generic-6.17        6.17.0-8.8
   linux-image-generic-64k         6.17.0-8.8
   linux-image-generic-64k-6.17    6.17.0-8.8
   linux-image-generic-64k-hwe-24.04  6.17.0-8.8
   linux-image-generic-64k-hwe-24.04-edge  6.17.0-8.8
   linux-image-generic-hwe-24.04   6.17.0-8.8
   linux-image-generic-hwe-24.04-edge  6.17.0-8.8
   linux-image-oem-24.04           6.17.0-8.8
   linux-image-oem-24.04c          6.17.0-8.8
   linux-image-realtime            6.17.0-1004.5
   linux-image-realtime-6.17       6.17.0-1004.5
   linux-image-realtime-hwe-24.04  6.17.0-1004.5
   linux-image-realtime-hwe-24.04-edge  6.17.0-1004.5
   linux-image-virtual             6.17.0-8.8
   linux-image-virtual-6.17        6.17.0-8.8
   linux-image-virtual-hwe-24.04   6.17.0-8.8
   linux-image-virtual-hwe-24.04-edge  6.17.0-8.8

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.