==========================================================================
Ubuntu Security Notice USN-7906-2
December 05, 2025

linux-gcp vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-gcp: 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:
  - x86 architecture;
  - Cryptographic API;
  - Android drivers;
  - TTY drivers;
  - F2FS file system;
  - 9P file system network protocol;
(CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028,
CVE-2025-40108, CVE-2025-40109)

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-gcp     6.17.0-1004.4
  linux-image-6.17.0-1004-gcp-64k  6.17.0-1004.4
  linux-image-gcp                 6.17.0-1004.4
  linux-image-gcp-6.17            6.17.0-1004.4
  linux-image-gcp-64k             6.17.0-1004.4
  linux-image-gcp-64k-6.17        6.17.0-1004.4

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-7906-2
  https://ubuntu.com/security/notices/USN-7906-1
  CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028,
  CVE-2025-40108, CVE-2025-40109

Package Information:
  https://launchpad.net/ubuntu/+source/linux-gcp/6.17.0-1004.4