In brief: Secure-Boot certificates expire on 24 June 2026 for Linux VMs on Azure and require renewal by VM administrators.
Microsoft published guidance on 22 June 2026 regarding Secure-Boot certificate updates that expire starting 24 June 2026, affecting Linux systems on Azure VMs. CISOs must coordinate renewals in their virtual infrastructures to prevent boot outages.
Microsoft published a support article on 22 June 2026 addressing the expiration of Secure-Boot certificates for Linux machines on the Azure platform. Starting 24 June 2026, these certificates will become invalid and may cause boot problems for virtualized Linux systems.
This is relevant for security officers because expired Secure-Boot certificates compromise a control layer of the boot process. Secure Boot prevents unsigned or tampered boot loaders from being loaded and is a core component of the trust chain during system startup. For virtual machines on Azure, this update must be proactively scheduled to avoid unplanned downtime.
The Microsoft support document from 22 June 2026 contains specific guidance on performing certificate updates for affected Linux VMs. CISOs should take inventory of their virtual Linux infrastructure, define update cycles, and deploy patches before the expiration date to ensure the availability and security of their cloud environments.
Source: borncity.com · Published 23 June 2026
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