CVE-2026-93076 PUBLISHED

dax/fsdev: clear vmemmap_shift when binding static pgmap

Assigner: Linux
Reserved: 17.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from d5406bd458b0ac10b1301a4d5801d85c8f648637 to d298a0513aaf7d48f2a9f4a90041de910750cfcf (excl.)
  • affected from d5406bd458b0ac10b1301a4d5801d85c8f648637 to e0239229931faf9ca3367e3befcf16f77b2cd45b (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 7.1 is affected
  • unaffected from 0 to 7.1 (excl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References