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Ubuntu 16.04 LTS USN-8361-3 Linux Kernel Critical Packet Socket Threat

ubuntu
Calendar Grey June 17, 2026
Dist Ubuntu Esm H88
A critical security advisory for Ubuntu 16.04 LTS warns of potential system compromise due to kernel vulnerabilities.
The system could be compromised under certain conditions.

Summary

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)

Topics%20covered

Topics Covered

security advisory critical Ubuntu compromise Linux kernel packet sockets

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8361-3

Topics%20covered

Topics Covered

security advisory critical Ubuntu compromise Linux kernel packet sockets

Package Information

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