dax/fsdev: clear vmemmap_shift when binding static pgmap

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In the Linux kernel, the following vulnerability has been resolved: dax/fsdev: clear vmemmap_shift when binding static pgmap Clear pgmap->vmemmap_shift for static DAX devices. When rebinding a static device from device_dax (which may set vmemmap_shift based on alignment) to fsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly zero it before devm_memremap_pages() so the vmemmap is built for order-0 folios as fsdev requires.

Source published

17 Sep 2026 16:10:58 UTC

Source modified

19 Oct 2026 09:05:11 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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