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Canadacow
Occasional Reader
Feb 02, 2026

Windows KB5074109 breaks Vulkan resource interop

I and others unrelatedly have noticed a severe regression in Vulkan and interop with regard to the specification. An example of this is here on the Nvidia forums: https://forums.developer.nvidia.com/t/cuda-vulkan-image-interop-broken-on-windows/359258

 

Per the CUDA documentation, "On Linux and Windows 10, both dedicated and non-dedicated memory objects exported by Vulkan can be imported into CUDA." What appears to be happening is that Windows is incorrectly, for a random set of Vulkan external resources, not correctly addressing the resource. Setting it to dedicated appears to resolve this but not entirely. Given myself and others have resolved the issue by backing out KB5074109, the regression lies in how WDDM is managing shared resources between the driver and the OS. I hope this can be addressed.

 

Happy to provide a strawman example upon request.

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