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Windows 11 Bug Breaks Shared Folders in Hyper-V Linux VMs After KB5124008 Install

Guavy AI Editorial Team
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A bug in Windows 11 has been discovered that prevents Hyper-V-based Linux virtual machines from accessing shared folders from the host machine. The issue, confirmed by Microsoft, occurs after installing KB5124008.

The problem affects applications such as Claude Cowork and WSL (Windows Subsystem for Linux) that use Plan9 for host-folder sharing within HCS-managed virtual machines.

Linux virtual machines still start normally, but Windows folders shared with the guest may not appear or become inaccessible. Applications relying on these folders can display errors indicating that expected Plan9 drive shares have not mounted.

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