Bug 2516724 (CVE-2026-68461)

Summary: CVE-2026-68461 kernel: device property: initialize the remaining fields of fwnode_handle in fwnode_init()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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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A flaw was found in the Linux kernel. When a firmware node is allocated and initialized using `fwnode_init()`, a pointer within the `fwnode_handle` structure may contain uninitialized memory. This can occur if a non-zeroing allocation function is used. If this uninitialized pointer is subsequently dereferenced, it could lead to system instability or a denial of service (DoS).
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Description OSIDB Bzimport 2026-08-15 06:27:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

device property: initialize the remaining fields of fwnode_handle 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 uninitialized 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. While at it: initialize the remaining fields of struct
fwnode_handle too just to be sure.

[ Fix typo in commit message. - Danilo ]
Comment 1 Keith Grant 2026-08-17 13:32:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081503-CVE-2026-68461-a9a4@gregkh/T