[GLOBAL][Containers & Orchestration] - Managed Kubernetes Service event notification

Update timeline

1. identified Apr 30, 2026, 03:27 PM UTC

   We are currently experiencing an ongoing security event affecting our Managed Kubernetes Service. The source of the issue has been identified. Start time : 22/04/2026 08:15 UTC Impacted service(s) : Managed Kubernetes Service (MKS) worker nodes. Customer impact : A recently disclosed security vulnerability may allow a user within a container to gain elevated access on the underlying node. This issue is limited to individual clusters and does not impact other customers or the managed control plane. Customers running shared or multi-tenant workloads within the same cluster should consider this issue with higher priority. Other OVHcloud managed services (MPR, MRS) are patched transparently by OVHcloud, no customer action required. Root Cause : This incident is caused by a software issue. Workaround : A temporary mitigation is available to reduce the risk while we prepare a permanent fix. Instructions are available in our dedicated blog post: https://blog.ovhcloud.com/copy-fail-cve-2026-31431-how-to-rapidly-protect-ovhcloud-mks-clusters-from-the-linux-kernel-zero-day Please note that applying this mitigation is optional and remains under your responsibility. If the vulnerability has already been exploited on your cluster, this mitigation will not remediate any pre-existing compromise Ongoing actions : Our teams are actively working on a permanent fix. Updated versions are expected to be available later today. We will share further details and update instructions as soon as they are ready. We will keep you informed of any progress. Thank you for your understanding.

2. resolved Apr 30, 2026, 04:16 PM UTC

   We are pleased to inform you that our teams released new versions to resolve the security event that affected our Managed Kubernetes Service. Start time : 22/04/2026 08:15 UTC End time : 30/04/2026 15:30 UTC Root Cause : This incident was caused by a software issue. We apologize for any inconvenience caused and appreciate your understanding.