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Ubuntu 18.04 16.04 Azure Kernel Critical System Compromise USN-8112-3

ubuntu
Calendar Grey March 24, 2026
Dist Ubuntu Esm H88
Critical updates for Ubuntu security issues in linux-azure kernel impact Azure systems; update recommended.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

- 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:

- 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)

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel issue system compromise linux-azure

Update Instructions

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1197-azure   4.15.0-1197.212
                                  Available with Ubuntu Pro
  linux-image-azure-4.15          4.15.0.1197.165
                                  Available with Ubuntu Pro
  linux-image-azure-lts-18.04     4.15.0.1197.165
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  linux-image-4.15.0-1197-azure   4.15.0-1197.212~16.04.1
                                  Available with Ubuntu Pro
  linux-image-azure               4.15.0.1197.212~16.04.1
                                  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-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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8112-3

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel issue system compromise linux-azure

Package Information

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