==========================================================================
Ubuntu Security Notice USN-8112-1
March 20, 2026

linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gcp-4.15, linux-hwe,
linux-kvm, linux-oracle vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

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)

Update instructions:

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1151-oracle  4.15.0-1151.162
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1171-kvm     4.15.0-1171.176
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1182-gcp     4.15.0-1182.199
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1189-aws     4.15.0-1189.202
                                  Available with Ubuntu Pro
  linux-image-4.15.0-247-generic  4.15.0-247.259
                                  Available with Ubuntu Pro
  linux-image-4.15.0-247-lowlatency  4.15.0-247.259
                                  Available with Ubuntu Pro
  linux-image-aws-4.15            4.15.0.1189.187
                                  Available with Ubuntu Pro
  linux-image-aws-lts-18.04       4.15.0.1189.187
                                  Available with Ubuntu Pro
  linux-image-gcp-4.15            4.15.0.1182.195
                                  Available with Ubuntu Pro
  linux-image-gcp-lts-18.04       4.15.0.1182.195
                                  Available with Ubuntu Pro
  linux-image-generic             4.15.0.247.231
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.15.0.1171.162
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.15.0.247.231
                                  Available with Ubuntu Pro
  linux-image-oracle-4.15         4.15.0.1151.156
                                  Available with Ubuntu Pro
  linux-image-oracle-lts-18.04    4.15.0.1151.156
                                  Available with Ubuntu Pro
  linux-image-virtual             4.15.0.247.231
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  linux-image-4.15.0-1151-oracle  4.15.0-1151.162~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1182-gcp     4.15.0-1182.199~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1189-aws     4.15.0-1189.202~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-247-generic  4.15.0-247.259~16.04.1
                                  Available with Ubuntu Pro
  linux-image-4.15.0-247-lowlatency  4.15.0-247.259~16.04.1
                                  Available with Ubuntu Pro
  linux-image-aws-hwe             4.15.0.1189.202~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gcp                 4.15.0.1182.199~16.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-hwe-16.04   4.15.0.247.259~16.04.1
                                  Available with Ubuntu Pro
  linux-image-gke                 4.15.0.1182.199~16.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-hwe-16.04  4.15.0.247.259~16.04.1
                                  Available with Ubuntu Pro
  linux-image-oem                 4.15.0.247.259~16.04.1
                                  Available with Ubuntu Pro
  linux-image-oracle              4.15.0.1151.162~16.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-hwe-16.04   4.15.0.247.259~16.04.1
                                  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-8112-1
  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