Bug 2393197 (CVE-2025-38725)

Summary: CVE-2025-38725 kernel: net: usb: asix_devices: add phy_mask for ax88772 mdio bus
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-04 16:04:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: usb: asix_devices: add phy_mask for ax88772 mdio bus

Without setting phy_mask for ax88772 mdio bus, current driver may create
at most 32 mdio phy devices with phy address range from 0x00 ~ 0x1f.
DLink DUB-E100 H/W Ver B1 is such a device. However, only one main phy
device will bind to net phy driver. This is creating issue during system
suspend/resume since phy_polling_mode() in phy_state_machine() will
directly deference member of phydev->drv for non-main phy devices. Then
NULL pointer dereference issue will occur. Due to only external phy or
internal phy is necessary, add phy_mask for ax88772 mdio bus to workarnoud
the issue.
Comment 1 Mauro Matteo Cascella 2025-09-22 13:28:21 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090401-CVE-2025-38725-eb3f@gregkh/T