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[USN-8922-2] Linux kernel (Azure) vulnerabilities

Posted on 15 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8922-2
October 15, 2026

linux-azure vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure 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:
- S390 architecture;
- IIO ADC drivers;
- Multiple devices driver;
- PCI subsystem;
- VFIO drivers;
- Network file system (NFS) server daemon;
- Overlay file system;
- IPv6 networking;
- Netfilter;
(CVE-2024-53194, CVE-2024-53214, CVE-2024-56570, CVE-2024-56779,
CVE-2024-57849, CVE-2024-57904, CVE-2024-57929, CVE-2025-21664,
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221)

Update instructions:

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

Ubuntu 16.04 LTS
linux-image-4.15.0-1208-azure 4.15.0-1208.223~16.04.1
Available with Ubuntu Pro
linux-image-azure 4.15.0.1208.223~16.04.1
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-8922-2
https://ubuntu.com/security/notices/USN-8922-1
CVE-2024-53194, CVE-2024-53214, CVE-2024-56570, CVE-2024-56779,
CVE-2024-57849, CVE-2024-57904, CVE-2024-57929, CVE-2025-21664,
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221

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