Ubuntu Security Notices
USN-8730-3

USN-8730-3: Linux kernel (Azure) vulnerability

Publication date

18 September 2026

Overview

A security issue was fixed in the Linux kernel.

Releases

22.04 LTS 20.04 LTS

Packages

linux-azure-5.15 - Linux kernel for Microsoft Azure cloud systems
linux-azure-fde-5.15 - Linux kernel for Microsoft Azure CVM cloud systems
linux-azure-fips - Linux kernel for Microsoft Azure Cloud systems with FIPS

Details

A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystems:

IPv6 networking;
Netfilter

A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystems:

IPv6 networking;
Netfilter

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release	Package Version
22.04 LTS jammy	linux-image-5.15.0-1121-azure-fips – 5.15.0-1121.130+fips1
	linux-image-azure-fips – 5.15.0.1121.105
	linux-image-azure-fips-5.15 – 5.15.0.1121.105
20.04 LTS focal	linux-image-5.15.0-1120-azure-fde – 5.15.0-1120.129~20.04.1
	linux-image-5.15.0-1121-azure – 5.15.0-1121.130~20.04.1
	linux-image-azure – 5.15.0.1121.130~20.04.1
	linux-image-azure-5.15 – 5.15.0.1121.130~20.04.1
	linux-image-azure-cvm – 5.15.0.1121.130~20.04.1
	linux-image-azure-fde – 5.15.0.1120.129~20.04.1
	linux-image-azure-fde-5.15 – 5.15.0.1120.129~20.04.1