SimplerCloud Pte Ltd

First posted on Friday, 8 May 2026

This advisory is provided as a courtesy.

We want to bring to your attention a newly discovered vulnerability affecting major Linux OS distributions. The vulnerability, known as "Copy Fail", has been assigned CVE number: CVE-2026-31431 with CVSS score of 7.8 out of 10. It affects all major Linux distributions running kernel versions released since 2017.

Affected Software

Most major Linux distributions such as Ubuntu (certain releases) and AlmaLinux are affected.

How to Fix the Problem

Update to the latest kernel version depending on the Linux OS.

On Ubuntu systems:

apt update
apt upgrade
apt dist-upgrade (to install all patches)

On AlmaLinux systems:

dnf clean all
dnf update kernel -y

Note: The patches might not be available for older distributions and operating systems that are already EOL (end-of-life) and no longer supported, such as CentOS systems. For this one, you need to upgrade to supported operating systems.

More Information

High Severity Vulnerability in Linux Kernel

CVE-2026-31431: “Copy Fail” Linux kernel flaw lets local users gain root in seconds

CVE-2026-31431 Detail

Request Assistance

If you are running vulnerable Linux distributions and need our assistance to patch it up or to perform the workaround, we can do it for you at a one-time discounted fee of $30. Please submit your order at Order -> Additional Services -> Vulnerability Fix - Linux Kernel Vulnerability - $30.

Note: This service is only applicable for supported operating systems that is generally still maintained and not EOL. Please check with us first by opening a ticket before ordering this service.

Alternatively, please first open a support ticket and give us the hostname, IP address and OS template. You can find this information on your servelet's control panel.

For example:

Hostname: yourservelethostname
IP Address: 103.25.202.81
OS Template: Ubuntu 22.04 LTS (64-bit)

Thank you.