[USN-7684-1] Linux kernel vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7684-1
July 31, 2025

linux, linux-aws, linux-kvm vulnerabilities
==========================================================================

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

- 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-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:
  - SCSI subsystem;
  - TTY drivers;
  - Ext4 file system;
  - Bluetooth subsystem;
  - USB sound devices;
(CVE-2023-52975, CVE-2024-53239, CVE-2024-49883, CVE-2024-50073,
CVE-2024-49950)

Update instructions:

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

Ubuntu 16.04 LTS
  linux-image-4.4.0-1147-kvm      4.4.0-1147.158
                                  Available with Ubuntu Pro
  linux-image-4.4.0-1184-aws      4.4.0-1184.199
                                  Available with Ubuntu Pro
  linux-image-4.4.0-271-generic   4.4.0-271.305
                                  Available with Ubuntu Pro
  linux-image-4.4.0-271-lowlatency  4.4.0-271.305
                                  Available with Ubuntu Pro
  linux-image-aws                 4.4.0.1184.188
                                  Available with Ubuntu Pro
  linux-image-generic             4.4.0.271.277
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.271.277
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.4.0.1147.144
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.4.0.271.277
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.271.277
                                  Available with Ubuntu Pro
  linux-image-virtual             4.4.0.271.277
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.271.277
                                  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-7684-1
  CVE-2023-52975, CVE-2024-49883, CVE-2024-49950, CVE-2024-50073,
  CVE-2024-53239

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