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[USN-8112-4] Linux kernel (Azure FIPS) vulnerabilities

Posted on 24 March 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8112-4
March 24, 2026

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:
- x86 architecture;
- MMC subsystem;
- Network drivers;
- USB Device Class drivers;
- BTRFS file system;
- HFS+ file system;
- XFRM subsystem;
- IPv4 networking;
- IPv6 networking;
- MAC80211 subsystem;
- Simplified Mandatory Access Control Kernel framework;
(CVE-2021-47599, CVE-2022-48875, CVE-2022-49267, CVE-2024-47659,
CVE-2024-49927, CVE-2024-56548, CVE-2024-56581, CVE-2024-56593,
CVE-2025-21704, CVE-2025-40215)

Update instructions:

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

Ubuntu 18.04 LTS
linux-image-4.15.0-2106-azure-fips 4.15.0-2106.112
Available with Ubuntu Pro
linux-image-azure-fips 4.15.0.2106.102
Available with Ubuntu Pro
linux-image-azure-fips-4.15 4.15.0.2106.102
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-8112-4
https://ubuntu.com/security/notices/USN-8112-3
https://ubuntu.com/security/notices/USN-8112-2
https://ubuntu.com/security/notices/USN-8112-1
CVE-2021-47599, CVE-2022-48875, CVE-2022-49267, CVE-2024-47659,
CVE-2024-49927, CVE-2024-56548, CVE-2024-56581, CVE-2024-56593,
CVE-2025-21704, CVE-2025-40215

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure-fips/4.15.0-2106.112


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