CVE-2026-93076 dax/fsdev: clear vmemmap_shift when binding static pgmap
A stale vmemmap_shift in the Linux kernel DAX subsystem can cause memory mapping errors when rebinding devices, potentially leading to system instability or crashes.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93076?
CVE-2026-93076 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-93076?
How do I fix CVE-2026-93076?
Apply the vendor's patch.
Is CVE-2026-93076 being exploited?
There is no known exploitation of CVE-2026-93076 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93076, GHSA-m5cm-762c-jpjj, UBUNTU-CVE-2026-93076.