Azure Linux 4.0 enters public preview as Microsoft's first general-purpose cloud OS for any Azure VM
By
Hayden Barnes
Hot, fresh, and worth queueing round the block for.
Summary
Microsoft has released Azure Linux 4.0 into public preview at Build 2026, marking a significant evolution from its origins as CBL-Mariner. For the first time, this in-house Linux distribution can run on any Azure virtual machine, not just as the host OS underneath Azure Kubernetes Service. This move represents a major step in Microsoft's Linux journey, transforming Azure Linux from a specialized internal tool into a general-purpose cloud operating system available to all Azure customers.
Key quotes
· 3 pulledMicrosoft shipped Azure Linux 4.0 into public preview at Build 2026, and for the first time you can run it on any Azure virtual machine, not just as the host underneath Azure Kubernetes Service.
Here is why that is a real step in Microsoft's Linux journey, not just a version bump.
The distribution that grew out of CBL-Mariner, just hit public preview as a general-purpose cloud OS you can run on any Azure VM.
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