Home / mailings [USN-8864-1] Linux kernel vulnerabilities
Posted on 02 October 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8864-1
October 02, 2026
linux, linux-aws, linux-fips, linux-kvm, linux-lts-xenial vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
- Ubuntu 14.04 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-fips: Linux kernel with FIPS
- linux-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
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 16.04 LTS
linux-image-4.4.0-1129-fips 4.4.0-1129.136
Available with Ubuntu Pro
linux-image-4.4.0-1160-kvm 4.4.0-1160.171
Available with Ubuntu Pro
linux-image-4.4.0-1197-aws 4.4.0-1197.212
Available with Ubuntu Pro
linux-image-4.4.0-288-generic 4.4.0-288.322
Available with Ubuntu Pro
linux-image-4.4.0-288-lowlatency 4.4.0-288.322
Available with Ubuntu Pro
linux-image-aws 4.4.0.1197.201
Available with Ubuntu Pro
linux-image-fips 4.4.0.1129.131
Available with Ubuntu Pro
linux-image-generic 4.4.0.288.294
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.288.294
Available with Ubuntu Pro
linux-image-kvm 4.4.0.1160.157
Available with Ubuntu Pro
linux-image-lowlatency 4.4.0.288.294
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.288.294
Available with Ubuntu Pro
linux-image-virtual 4.4.0.288.294
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.288.294
Available with Ubuntu Pro
Ubuntu 14.04 LTS
linux-image-4.4.0-1159-aws 4.4.0-1159.165
Available with Ubuntu Pro
linux-image-4.4.0-288-generic 4.4.0-288.322~14.04.1
Available with Ubuntu Pro
linux-image-4.4.0-288-lowlatency 4.4.0-288.322~14.04.1
Available with Ubuntu Pro
linux-image-aws 4.4.0.1159.156
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.288.322~14.04.1
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.288.322~14.04.1
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.288.322~14.04.1
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-8864-1
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221
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