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Ubuntu 18.04 LTS Kernel Important Security Update USN-8112-2 CVE-2021-47599

ubuntu
Calendar Grey March 20, 2026
Dist Ubuntu Esm H88
This advisory addresses critical security issues in the Ubuntu kernel requiring immediate updates for systems at risk.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS

- linux-fips: Linux kernel with FIPS

- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) 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)

Topics%20covered

Topics Covered

security advisory security update Ubuntu important kernel system compromise

Update Instructions

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1144-fips    4.15.0-1144.156
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2090-gcp-fips  4.15.0-2090.96
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2127-aws-fips  4.15.0-2127.133
                                  Available with Ubuntu Pro
  linux-image-aws-fips            4.15.0.2127.121
                                  Available with Ubuntu Pro
  linux-image-aws-fips-4.15       4.15.0.2127.121
                                  Available with Ubuntu Pro
  linux-image-fips                4.15.0.1144.141
                                  Available with Ubuntu Pro
  linux-image-gcp-fips            4.15.0.2090.88
                                  Available with Ubuntu Pro
  linux-image-gcp-fips-4.15       4.15.0.2090.88
                                  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-8112-2

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
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8112-2

Topics%20covered

Topics Covered

security advisory security update Ubuntu important kernel system compromise

Package Information

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