Bug 2506802 (CVE-2026-64220)

Summary: CVE-2026-64220 kernel: device property: set fwnode->secondary to NULL in fwnode_init()
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2026-07-24 16:04:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

device property: set fwnode->secondary to NULL in fwnode_init()

If a firmware node is allocated on the stack (for instance: temporary
software node whose life-time we control) or on the heap - but using a
non-zeroing allocation function - and initialized using fwnode_init(),
its secondary pointer will contain uninitalized memory which likely will
be neither NULL nor IS_ERR() and so may end up being dereferenced (for
example: in dev_to_swnode()). Set fwnode->secondary to NULL on
initialization.
Comment 1 Mauro Matteo Cascella 2026-07-28 10:31:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072416-CVE-2026-64220-bff1@gregkh/T