Kernel Vulnerability in Micrel LAN8814 by Linux

CVE-2025-40239

What is CVE-2025-40239?

A vulnerability exists in the Linux kernel's handling of the LAN8814 PTP probe, where the phydev pointer is not set unconditionally. This oversight can lead to a NULL pointer dereference during interrupt handling, specifically in the function lan8814_gpio_process_cap, resulting in a kernel crash. By ensuring that shared->phydev is always set, the risk of encountering a NULL pointer exception is mitigated, thus enhancing system stability.

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