Bug 2396942 (CVE-2025-39856)

Summary: CVE-2025-39856 kernel: net: ethernet: ti: am65-cpsw-nuss: Fix null pointer dereference for ndev
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-19 16:03:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: ti: am65-cpsw-nuss: Fix null pointer dereference for ndev

In the TX completion packet stage of TI SoCs with CPSW2G instance, which
has single external ethernet port, ndev is accessed without being
initialized if no TX packets have been processed. It results into null
pointer dereference, causing kernel to crash. Fix this by having a check
on the number of TX packets which have been processed.
Comment 1 Jon Moroney 2025-09-19 16:27:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091905-CVE-2025-39856-cca3@gregkh/T