========================================================================== Ubuntu Security Notice USN-8361-3 June 17, 2026
linux, linux-aws, linux-kvm vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
The system could be compromised under certain conditions.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
Details:
A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystem:
- Packet sockets;
(CVE-2026-31504)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1156-kvm 4.4.0-1156.167
Available with Ubuntu Pro
linux-image-4.4.0-1193-aws 4.4.0-1193.208
Available with Ubuntu Pro
linux-image-4.4.0-281-generic 4.4.0-281.315
Available with Ubuntu Pro
linux-image-4.4.0-281-lowlatency 4.4.0-281.315
Available with Ubuntu Pro
linux-image-aws 4.4.0.1193.197
Available with Ubuntu Pro
linux-image-generic 4.4.0.281.287
Available with Ubuntu Pro
linux-image-generic-lts-xenial 4.4.0.281.287
Available with Ubuntu Pro
linux-image-kvm 4.4.0.1156.153
Available with Ubuntu Pro
linux-image-lowlatency 4.4.0.281.287
Available with Ubuntu Pro
linux-image-lowlatency-lts-xenial 4.4.0.281.287
Available with Ubuntu Pro
linux-image-virtual 4.4.0.281.287
Available with Ubuntu Pro
linux-image-virtual-lts-xenial 4.4.0.281.287
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-8361-3
https://ubuntu.com/security/notices/USN-8361-2
https://ubuntu.com/security/notices/USN-8361-1
CVE-2026-31504
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