Possible temporary service interruptions due to Critical Linux Kernel Vulnerability (CVE-2026-31431)

Update timeline

1. identified Apr 30, 2026, 06:45 AM UTC

   Due to the recently disclosed “[Copy Fail](https://copy.fail/)” (CVE-2026-31431) Linux kernel vulnerability, our system administrators are actively applying mitigation measures and updates across all Tartu University HPC Center systems today. As a result, you may experience temporary interruptions or reduced service availability while this work is in progress. All UT HPC services are affected. At this time, the work is expected to be completed today; however, we will provide further updates if the situation extends beyond today.continuing to work on a fix for this incident. **Users running their own Linux virtual machines are advised to apply the recommended patches on their systems by following the instructions provided in the “Mitigation” section of the** [**CVE-2026-31431 advisory**](https://copy.fail/)**.** Thank you for your understanding.

2. identified Apr 30, 2026, 08:41 AM UTC

   $18

3. identified Apr 30, 2026, 09:43 AM UTC

   We have created a documentation for CVE-2026-31431 mitigation: This is primarily useful for UT Cloud virtual machine managers. We'll keep updating the document with the best approaches as we learn more.

4. resolved Apr 30, 2026, 01:48 PM UTC

   We have applied mitigation measures for the Critical Linux Kernel Vulnerability (CVE-2026-31431) across all affected services. The incident is resolved. However, the virtual machine managers are still required to apply the patches following the guides published here: You are welcome to contact support for additional information: [[email protected]](mailto:[email protected]) Best, UT HPC Center