dax/fsdev: clear pgmap ops and owner on unbind

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Summary

CVECVE-2026-93075
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:01 UTC
Updated2026-09-17 17:18:01 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.050810000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d5406bd458b0ac10b1301a4d5801d85c8f648637 9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27 git Not specified
CNA Linux Linux affected d5406bd458b0ac10b1301a4d5801d85c8f648637 f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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