Ubuntu alert USN-7864-1 (linux-gcp, linux-gcp-6.8, linux-gke)

From:
             
 
Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7864-1] Linux kernel (GCP and GKE) vulnerabilities
Date:
             
 
Fri, 07 Nov 2025 10:13:39 +0100
Message-ID:
             
 
<528068e3-eaeb-4ed8-834a-3aa5a3678780@canonical.com>
==========================================================================
Ubuntu Security Notice USN-7864-1
November 07, 2025

linux-gcp, linux-gcp-6.8, linux-gke 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gcp-6.8: Linux kernel for Google Cloud Platform (GCP) systems

Details:

Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)

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:
   - HSI subsystem;
   - I2C subsystem;
   - Bluetooth subsystem;
   - Timer subsystem;
(CVE-2025-37838, CVE-2025-38118, CVE-2025-38352, CVE-2025-38425)

Update instructions:

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

Ubuntu 24.04 LTS
   linux-image-6.8.0-1039-gke      6.8.0-1039.44
   linux-image-6.8.0-1039-gke-64k  6.8.0-1039.44
   linux-image-6.8.0-1043-gcp      6.8.0-1043.46
   linux-image-6.8.0-1043-gcp-64k  6.8.0-1043.46
   linux-image-gcp-6.8             6.8.0-1043.46
   linux-image-gcp-64k-6.8         6.8.0-1043.46
   linux-image-gcp-64k-lts-24.04   6.8.0-1043.46
   linux-image-gcp-lts-24.04       6.8.0-1043.46
   linux-image-gke                 6.8.0-1039.44
   linux-image-gke-6.8             6.8.0-1039.44
   linux-image-gke-64k             6.8.0-1039.44
   linux-image-gke-64k-6.8         6.8.0-1039.44

Ubuntu 22.04 LTS
   linux-image-6.8.0-1043-gcp      6.8.0-1043.46~22.04.1
   linux-image-6.8.0-1043-gcp-64k  6.8.0-1043.46~22.04.1
   linux-image-gcp                 6.8.0-1043.46~22.04.1
   linux-image-gcp-6.8             6.8.0-1043.46~22.04.1
   linux-image-gcp-64k             6.8.0-1043.46~22.04.1
   linux-image-gcp-64k-6.8         6.8.0-1043.46~22.04.1

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.

References:
   https://ubuntu.com/security/notices/USN-7864-1
   CVE-2025-37838, CVE-2025-38118, CVE-2025-38352, CVE-2025-38425,
   CVE-2025-40300

Package Information:
   https://launchpad.net/ubuntu/+source/linux-gcp/6.8.0-1043.46
   https://launchpad.net/ubuntu/+source/linux-gke/6.8.0-1039.44
   https://launchpad.net/ubuntu/+source/linux-gcp-6.8/6.8.0-...



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