Critical Security Advisory – Immediate Action Required for Linux “Copy Fail” Vulnerability (CVE-2026-31431)
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Wednesday, 29th April, 2026
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14:39pm
We would like to notify you of a critical Linux kernel vulnerability identified as CVE-2026-31431, commonly referred to as “Copy Fail.”
This vulnerability affects multiple Linux distributions and may allow a local unprivileged user to escalate privileges and gain root access on vulnerable systems.
Due to the availability of public proof-of-concept exploit code, we strongly advise all VPS and Dedicated Server clients to apply security updates immediately.
Recommended Mitigation Steps
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Update Your System
For Ubuntu / Debian systems:
sudo apt update
sudo apt upgrade -y
For RHEL / AlmaLinux / Rocky Linux / CentOS systems:
sudo yum update -y
After updates are completed, reboot the server to load the patched kernel:
sudo reboot
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Disable the Vulnerable algif_aead Kernel Module
As an additional mitigation measure, disable the algif_aead module if it is not required by your applications.
Run the following commands as root:
echo "install algif_aead /bin/false" > /etc/modprobe.d/disable-algif.conf
rmmod algif_aead
This prevents the vulnerable module from being loaded into the kernel.
Important Notes
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Ensure you verify application compatibility before disabling kernel modules in production environments.
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Rebooting after updates is highly recommended to ensure the new kernel is active.
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Managed hosting clients will receive security maintenance assistance where applicable.
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Unmanaged VPS and Dedicated Server clients are responsible for securing and updating their own systems.
Our technical team continues to monitor upstream advisories and apply necessary mitigations across managed infrastructure.
If you require assistance with kernel updates, server hardening, or security reviews, please contact our support team through the client portal.
