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[USN-8819-2] Linux kernel vulnerabilities

Posted on 25 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8819-2
September 25, 2026

linux-aws, linux-gcp, linux-gcp-4.15, linux-gcp-fips 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-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) 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:
- Network file system (NFS) server daemon;
- IPv6 networking;
- Netfilter;
(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 18.04 LTS
linux-image-4.15.0-1190-gcp 4.15.0-1190.207
Available with Ubuntu Pro
linux-image-4.15.0-1197-aws 4.15.0-1197.210
Available with Ubuntu Pro
linux-image-4.15.0-2098-gcp-fips 4.15.0-2098.104
Available with Ubuntu Pro
linux-image-aws-4.15 4.15.0.1197.195
Available with Ubuntu Pro
linux-image-aws-lts-18.04 4.15.0.1197.195
Available with Ubuntu Pro
linux-image-gcp-4.15 4.15.0.1190.203
Available with Ubuntu Pro
linux-image-gcp-fips 4.15.0.2098.96
Available with Ubuntu Pro
linux-image-gcp-fips-4.15 4.15.0.2098.96
Available with Ubuntu Pro
linux-image-gcp-lts-18.04 4.15.0.1190.203
Available with Ubuntu Pro

Ubuntu 16.04 LTS
linux-image-4.15.0-1190-gcp 4.15.0-1190.207~16.04.1
Available with Ubuntu Pro
linux-image-gcp 4.15.0.1190.207~16.04.1
Available with Ubuntu Pro
linux-image-gke 4.15.0.1190.207~16.04.1
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-8819-2
https://ubuntu.com/security/notices/USN-8819-1
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221

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