CVE-2026-93075
UnknownSummary
In the Linux kernel, the dax/fsdev module's fsdev_dax_probe() sets pgmap->ops and pgmap->owner but never clears them on unbind. For a static device the pgmap is shared and long-lived, so after fsdev unbinds a static device the stale fsdev_pagemap_ops survives on the shared pgmap. A subsequent memory_failure can then dispatch through the stale, possibly freed handler.
Risk Assessment
This can lead to a use-after-free and kernel crash when handling memory errors after rebinding or unloading the fsdev_dax module.
Recommendation
Update the Linux kernel to a version with the fix. Avoid rebinding static DAX devices after fsdev unbind without updating.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dax/fsdev: clear pgmap ops and owner on unbind fsdev_dax_probe() sets pgmap->ops = &fsdev_pagemap_ops and pgmap->owner = dev_dax, but nothing ever clears them. For a dynamic device the pgmap is devm-allocated and freed on unbind, so this is harmless. For a static device the pgmap is the shared, long-lived one owned by the dax bus (kill_dev_dax() only NULLs dev_dax->pgmap for the non-static case), and device.c's probe sets only pgmap->type, never clearing ops/owner. So after fsdev unbinds a static device the stale fsdev_pagemap_ops survives on the shared pgmap. If the device is then rebound to device_dax (MEMORY_DEVICE_GENERIC, which installs no ->memory_failure), or the fsdev_dax module is unloaded, a subsequent memory_failure on that pgmap dispatches through the stale -- and possibly freed -- handler. Register a devm action that clears pgmap->ops and pgmap->owner on unbind, symmetric with setting them at probe, so the pgmap carries no fsdev state once fsdev is detached.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS