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Ubuntu 16.04 LTS linux-fips Critical Risk Compromise CVE-2026-31504

ubuntu
Calendar Grey June 4, 2026
Dist Ubuntu Esm H88
Critical update for Ubuntu 16.04 LTS addressing a potential attack via the linux-fips kernel. Immediate action needed.
The system could be compromised under certain conditions.

Summary

The system could be compromised under certain conditions.

Software Description:

- linux-fips: Linux kernel with FIPS

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 attack compromise linux-fips

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS
   linux-image-4.4.0-1125-fips     4.4.0-1125.132
                                   Available with Ubuntu Pro
   linux-image-fips                4.4.0.1125.127
                                   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-8361-2

https://ubuntu.com/security/notices/USN-8361-1

CVE-2026-31504

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8361-2

Topics%20covered

Topics Covered

security advisory critical Ubuntu attack compromise linux-fips

Package Information

https://launchpad.net/ubuntu/+source/linux-fips/4.4.0-1125.132

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