Bug 2396929 (CVE-2025-39853)

Summary: CVE-2025-39853 kernel: i40e: Fix potential invalid access when MAC list is empty
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-19 16:02:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i40e: Fix potential invalid access when MAC list is empty

list_first_entry() never returns NULL - if the list is empty, it still
returns a pointer to an invalid object, leading to potential invalid
memory access when dereferenced.

Fix this by using list_first_entry_or_null instead of list_first_entry.
Comment 1 Jon Moroney 2025-09-19 17:00:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091904-CVE-2025-39853-a617@gregkh/T