What’s Vulnerable › Vulnerabilities

CVE-2025-40239: net: phy: micrel: always set shared->phydev for LAN8814

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-04 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.

Affected products

• Linux kernel: 6.10 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844
• https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715
• https://git.kernel.org/stable/c/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e

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