=========================================================================
Ubuntu Security Notice USN-7685-1
August 05, 2025

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-hwe, linux-kvm vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

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:
  - Device tree and open firmware driver;
  - SCSI subsystem;
  - TTY drivers;
  - Ext4 file system;
  - SMB network file system;
  - Bluetooth subsystem;
  - Network traffic control;
  - Sun RPC protocol;
  - USB sound devices;
(CVE-2024-53239, CVE-2023-52975, CVE-2024-38541, CVE-2023-52885,
CVE-2024-49883, CVE-2025-37797, CVE-2023-52757, CVE-2024-56748,
CVE-2024-49950, CVE-2024-50073)

Update instructions:

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1166-kvm     4.15.0-1166.171
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1176-gcp     4.15.0-1176.193
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1183-aws     4.15.0-1183.196
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1191-azure   4.15.0-1191.206
                                  Available with Ubuntu Pro
  linux-image-4.15.0-240-generic  4.15.0-240.252
                                  Available with Ubuntu Pro
  linux-image-4.15.0-240-lowlatency  4.15.0-240.252
                                  Available with Ubuntu Pro
  linux-image-aws-4.15            4.15.0.1183.181
                                  Available with Ubuntu Pro
  linux-image-aws-lts-18.04       4.15.0.1183.181
                                  Available with Ubuntu Pro
  linux-image-azure-4.15          4.15.0.1191.159
                                  Available with Ubuntu Pro
  linux-image-azure-lts-18.04     4.15.0.1191.159
                                  Available with Ubuntu Pro
  linux-image-gcp-4.15            4.15.0.1176.189
                                  Available with Ubuntu Pro
  linux-image-gcp-lts-18.04       4.15.0.1176.189
                                  Available with Ubuntu Pro
  linux-image-generic             4.15.0.240.224
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.15.0.1166.157
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.15.0.240.224
                                  Available with Ubuntu Pro
  linux-image-virtual             4.15.0.240.224
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  linux-image-4.15.0-1176-gcp     4.15.0-1176.193~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1183-aws     4.15.0-1183.196~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1191-azure   4.15.0-1191.206~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-240-generic  4.15.0-240.252~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-240-lowlatency  4.15.0-240.252~16.04.1
                                  Available with Ubuntu Pro
  linux-image-aws-hwe             4.15.0.1183.196~16.04.1
                                  Available with Ubuntu Pro
  linux-image-azure               4.15.0.1191.206~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gcp                 4.15.0.1176.193~16.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-hwe-16.04   4.15.0.240.252~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gke                 4.15.0.1176.193~16.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-hwe-16.04  4.15.0.240.252~16.04.1
                                  Available with Ubuntu Pro
  linux-image-oem                 4.15.0.240.252~16.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-hwe-16.04   4.15.0.240.252~16.04.1
                                  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-7685-1
  CVE-2023-52757, CVE-2023-52885, CVE-2023-52975, CVE-2024-38541,
  CVE-2024-49883, CVE-2024-49950, CVE-2024-50073, CVE-2024-53239,
  CVE-2024-56748, CVE-2025-37797