CVE-2025-21743 usbnet: ipheth: fix possible overflow in DPE length check
An integer overflow in the Linux kernel's ipheth driver allows out-of-bounds reads, potentially exposing sensitive memory data.
- 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-2025-21743?
CVE-2025-21743 is a high-severity vulnerability in Linux kernel, published on 27 Feb 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:
usbnet: ipheth: fix possible overflow in DPE length check
Originally, it was possible for the DPE length check to overflow if wDatagramIndex + wDatagramLength > U16_MAX. This could lead to an OoB read.
Move the wDatagramIndex term to the other side of the inequality.
An existing condition ensures that wDatagramIndex < urb->actual_length.
Weakness: CWE-125
Which versions are affected by CVE-2025-21743?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21743?
Apply the vendor's patch.
Is CVE-2025-21743 being exploited?
There is no known exploitation of CVE-2025-21743 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-21743, DEBIAN-CVE-2025-21743, GHSA-6xr9-pvgc-m3pc, ROOT-OS-UBUNTU-2404-CVE-2025-21743, UBUNTU-CVE-2025-21743.