[USN-7685-3] Linux kernel (FIPS) vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7685-3
August 05, 2025

linux-aws-fips, linux-azure-fips, linux-fips, linux-gcp-fips
vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS
- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS
- linux-fips: Linux kernel with FIPS
- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS

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-2023-52975, CVE-2024-56748, CVE-2023-52885, CVE-2025-37797,
CVE-2024-50073, CVE-2024-49950, CVE-2024-49883, CVE-2024-38541,
CVE-2023-52757, CVE-2024-53239)

Update instructions:

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1138-fips    4.15.0-1138.149
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2084-gcp-fips  4.15.0-2084.90
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2100-azure-fips  4.15.0-2100.106
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2121-aws-fips  4.15.0-2121.127
                                  Available with Ubuntu Pro
  linux-image-aws-fips            4.15.0.2121.115
                                  Available with Ubuntu Pro
  linux-image-aws-fips-4.15       4.15.0.2121.115
                                  Available with Ubuntu Pro
  linux-image-azure-fips          4.15.0.2100.96
                                  Available with Ubuntu Pro
  linux-image-azure-fips-4.15     4.15.0.2100.96
                                  Available with Ubuntu Pro
  linux-image-fips                4.15.0.1138.135
                                  Available with Ubuntu Pro
  linux-image-gcp-fips            4.15.0.2084.82
                                  Available with Ubuntu Pro
  linux-image-gcp-fips-4.15       4.15.0.2084.82
                                  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-7685-3
  https://ubuntu.com/security/notices/USN-7685-2
  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

Package Information:
  https://launchpad.net/ubuntu/+source/linux-aws-fips/4.15.0-2121.127
  https://launchpad.net/ubuntu/+source/linux-azure-fips/4.15.0-2100.106
  https://launchpad.net/ubuntu/+source/linux-fips/4.15.0-1138.149
  https://launchpad.net/ubuntu/+source/linux-gcp-fips/4.15.0-2084.90

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