Ubuntu alert USN-7796-4 (linux-azure-fips)

From:
             
 
Giampaolo Fresi Roglia <giampaolo.fresi.roglia@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7796-4] Linux kernel (Azure FIPS) kernel vulnerabilities
Date:
             
 
Mon, 13 Oct 2025 18:30:45 +0200
Message-ID:
             
 
<87tt02ojbe.fsf@canonical.com>
==========================================================================
Ubuntu Security Notice USN-7796-4
October 13, 2025

linux-azure-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-azure-fips: Linux kernel for Microsoft Azure Cloud 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:
  - Framebuffer layer;
  - BTRFS file system;
  - Ext4 file system;
  - Network file system (NFS) server daemon;
  - Packet sockets;
  - Network traffic control;
  - VMware vSockets driver;
(CVE-2025-38477, CVE-2025-38617, CVE-2025-21796, CVE-2025-38618,
CVE-2024-49924, CVE-2024-35849, CVE-2025-37785)

Update instructions:

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-2102-azure-fips  4.15.0-2102.108
                                  Available with Ubuntu Pro
  linux-image-azure-fips          4.15.0.2102.98
                                  Available with Ubuntu Pro
  linux-image-azure-fips-4.15     4.15.0.2102.98
                                  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-7796-4
  https://ubuntu.com/security/notices/USN-7796-3
  https://ubuntu.com/security/notices/USN-7796-2
  https://ubuntu.com/security/notices/USN-7796-1
  CVE-2024-35849, CVE-2024-49924, CVE-2025-21796, CVE-2025-37785,
  CVE-2025-38477, CVE-2025-38617, CVE-2025-38618

Package Information:
  https://launchpad.net/ubuntu/+source/linux-azure-fips/4.1...



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