Bug 2486444 (CVE-2026-46277)

Summary: CVE-2026-46277 kernel: mm/zone_device: do not touch device folio after calling ->folio_free()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's memory management, specifically within the `mm/zone_device` component. This vulnerability arises when a device folio is accessed after it has been freed and potentially reallocated by a driver. This can lead to memory corruption, which a local attacker could potentially leverage to cause a denial of service (DoS) or achieve other impacts.
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Description OSIDB Bzimport 2026-06-08 17:02:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/zone_device: do not touch device folio after calling ->folio_free()

The contents of a device folio can immediately change after calling
->folio_free(), as the folio may be reallocated by a driver with a
different order.  Instead of touching the folio again to extract the
pgmap, use the local stack variable when calling percpu_ref_put_many().
Comment 1 Keith Grant 2026-06-08 20:05:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060841-CVE-2026-46277-f398@gregkh/T