[USN-7726-4] Linux kernel vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7726-4
September 02, 2025

linux-gke, linux-ibm-5.15, linux-kvm vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-kvm: Linux kernel for cloud environments
- linux-ibm-5.15: Linux kernel for IBM cloud 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:
- NTFS3 file system;
- Network traffic control;
(CVE-2024-27407, CVE-2024-57996, CVE-2025-37752, CVE-2025-38350)

Update instructions:

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

Ubuntu 22.04 LTS
linux-image-5.15.0-1087-kvm 5.15.0-1087.92
linux-image-5.15.0-1088-gke 5.15.0-1088.94
linux-image-gke 5.15.0.1088.87
linux-image-gke-5.15 5.15.0.1088.87
linux-image-kvm 5.15.0.1087.83
linux-image-kvm-5.15 5.15.0.1087.83

Ubuntu 20.04 LTS
linux-image-5.15.0-1085-ibm 5.15.0-1085.88~20.04.1
Available with Ubuntu Pro
linux-image-ibm 5.15.0.1085.88~20.04.1
Available with Ubuntu Pro
linux-image-ibm-5.15 5.15.0.1085.88~20.04.1
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-7726-4
https://ubuntu.com/security/notices/USN-7726-3
https://ubuntu.com/security/notices/USN-7726-2
https://ubuntu.com/security/notices/USN-7726-1
CVE-2024-27407, CVE-2024-57996, CVE-2025-37752, CVE-2025-38350

Package Information:
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1088.94
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1087.92