Home / mailings [USN-8819-1] Linux kernel vulnerabilities
Posted on 25 September 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8819-1
September 24, 2026
linux, linux-hwe, linux-kvm 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-kvm: Linux kernel for cloud environments
- 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:
- 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-4.15.0-1179-kvm 4.15.0-1179.184
Available with Ubuntu Pro
linux-image-4.15.0-260-generic 4.15.0-260.272
Available with Ubuntu Pro
linux-image-4.15.0-260-lowlatency 4.15.0-260.272
Available with Ubuntu Pro
linux-image-generic 4.15.0.260.244
Available with Ubuntu Pro
linux-image-kvm 4.15.0.1179.170
Available with Ubuntu Pro
linux-image-lowlatency 4.15.0.260.244
Available with Ubuntu Pro
linux-image-virtual 4.15.0.260.244
Available with Ubuntu Pro
Ubuntu 16.04 LTS
linux-image-4.15.0-260-generic 4.15.0-260.272~16.04.2
Available with Ubuntu Pro
linux-image-4.15.0-260-lowlatency 4.15.0-260.272~16.04.2
Available with Ubuntu Pro
linux-image-generic-hwe-16.04 4.15.0.260.272~16.04.2
Available with Ubuntu Pro
linux-image-lowlatency-hwe-16.04 4.15.0.260.272~16.04.2
Available with Ubuntu Pro
linux-image-oem 4.15.0.260.272~16.04.2
Available with Ubuntu Pro
linux-image-virtual-hwe-16.04 4.15.0.260.272~16.04.2
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-8819-1
CVE-2025-38724, CVE-2026-53131, CVE-2026-53221
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