Explore top 10 tips to secure your open-source projects now. Read More

×
Alerts This Week
Warning Icon 1 543
Alerts This Week
Warning Icon 1 543

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

ubuntu
Calendar Grey June 17, 2026
Scroller 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

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.