[USN-7704-5] Linux kernel vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-7704-5
August 28, 2025

linux-gke, linux-kvm vulnerabilities
==========================================================================

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

- Ubuntu 22.04 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

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:
- Cryptographic API;
- Arm Firmware Framework for ARMv8-A(FFA);
- Multiple devices driver;
- Media drivers;
- Network drivers;
- NVDIMM (Non-Volatile Memory Device) drivers;
- NVME drivers;
- x86 platform drivers;
- TCM subsystem;
- Virtio drivers;
- File systems infrastructure;
- SMB network file system;
- LZO compression library;
- Digital Audio (PCM) driver;
- Tracing infrastructure;
- Padata parallel execution mechanism;
- CAN network layer;
- Networking core;
- TIPC protocol;
- ALSA framework;
(CVE-2025-38079, CVE-2025-38048, CVE-2025-38075, CVE-2025-38077,
CVE-2025-38035, CVE-2025-38037, CVE-2025-38034, CVE-2025-38058,
CVE-2025-38004, CVE-2025-38031, CVE-2025-38078, CVE-2025-38044,
CVE-2025-38066, CVE-2025-38052, CVE-2025-38043, CVE-2025-38065,
CVE-2025-38003, CVE-2025-38061, CVE-2025-38051, CVE-2025-38072,
CVE-2025-38068)

Update instructions:

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

Ubuntu 22.04 LTS
linux-image-5.15.0-1086-kvm 5.15.0-1086.91
linux-image-5.15.0-1087-gke 5.15.0-1087.93
linux-image-gke 5.15.0.1087.86
linux-image-gke-5.15 5.15.0.1087.86
linux-image-kvm 5.15.0.1086.82
linux-image-kvm-5.15 5.15.0.1086.82

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-7704-5
https://ubuntu.com/security/notices/USN-7704-4
https://ubuntu.com/security/notices/USN-7704-3
https://ubuntu.com/security/notices/USN-7704-2
https://ubuntu.com/security/notices/USN-7704-1
CVE-2025-38003, CVE-2025-38004, CVE-2025-38031, CVE-2025-38034,
CVE-2025-38035, CVE-2025-38037, CVE-2025-38043, CVE-2025-38044,
CVE-2025-38048, CVE-2025-38051, CVE-2025-38052, CVE-2025-38058,
CVE-2025-38061, CVE-2025-38065, CVE-2025-38066, CVE-2025-38068,
CVE-2025-38072, CVE-2025-38075, CVE-2025-38077, CVE-2025-38078,
CVE-2025-38079

Package Information:
https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1087.93
https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1086.91