Home / mailings [USN-9028-1] Linux kernel (Azure CVM) vulnerabilities
Posted on 10 November 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-9028-1
November 10, 2026
linux-azure-fde vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
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;
- Hardware monitoring drivers;
- OCFS2 file system;
(CVE-2025-21656, CVE-2026-63940, CVE-2026-74350)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
linux-image-5.15.0-1125-azure-fde 5.15.0-1125.134
linux-image-azure-fde-5.15 5.15.0.1125.134
linux-image-azure-fde-lts-22.04 5.15.0.1125.134
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-9028-1
CVE-2025-21656, CVE-2026-63940, CVE-2026-74350
Package Information:
https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1125.134
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