Bug 2536434 (CVE-2026-93075)

Summary: CVE-2026-93075 kernel: dax/fsdev: clear pgmap ops and owner on unbind
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's dax/fsdev component. When a static device is unbound, the pgmap operations and owner are not properly cleared. This can lead to a use-after-free vulnerability where a subsequent memory failure event might dispatch through a stale or freed handler, potentially causing a system crash or other unpredictable behavior.
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Description OSIDB Bzimport 2026-09-17 17:50:28 UTC 
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.
Comment 1 gkamathe 2026-09-19 22:57:27 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93075.mbox