Bug 2393179 (CVE-2025-38726)

Summary: CVE-2025-38726 kernel: net: ftgmac100: fix potential NULL pointer access in ftgmac100_phy_disconnect
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 2025-09-04 16:03:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: ftgmac100: fix potential NULL pointer access in ftgmac100_phy_disconnect

After the call to phy_disconnect() netdev->phydev is reset to NULL.
So fixed_phy_unregister() would be called with a NULL pointer as argument.
Therefore cache the phy_device before this call.
Comment 1 Jon Moroney 2025-09-04 18:11:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090402-CVE-2025-38726-e4a8@gregkh/T