CVE-2025-38726 net: ftgmac100: fix potential NULL pointer access in ftgmac100_phy_disconnect
A NULL pointer dereference in the ftgmac100 network driver can cause a kernel crash, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38726?
CVE-2025-38726 is a medium-severity vulnerability in Linux kernel, published on 4 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2025-38726?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38726?
Apply the vendor's patch.
Is CVE-2025-38726 being exploited?
There is no known exploitation of CVE-2025-38726 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-38726, DEBIAN-CVE-2025-38726, GHSA-2rff-fcfm-wv2q, UBUNTU-CVE-2025-38726.