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[USN-7796-4] Linux kernel (Azure FIPS) kernel vulnerabilities

Posted on 13 October 2025
Ubuntu Security

==========================================================================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/4.15.0-2102.108


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