CVE-2025-21742: usbnet: ipheth: use static NDP16 location in URB
In the Linux kernel, the following vulnerability has been resolved:
usbnet: ipheth: use static NDP16 location in URB
Original code allowed for the start of NDP16 to be anywhere within the URB based on the wNdpIndex value in NTH16. Only the start position of NDP16 was checked, so it was possible for even the fixed-length part of NDP16 to extend past the end of URB, leading to an out-of-bounds read.
On iOS devices, the NDP16 header always directly follows NTH16. Rely on and check for this specific format.
This, along with NCM-specific minimal URB length check that already exists, will ensure that the fixed-length part of NDP16 plus a set amount of DPEs fit within the URB.
Note that this commit alone does not fully address the OoB read. The limit on the amount of DPEs needs to be enforced separately.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-21742?
CVE-2025-21742 is considered to have a moderate severity level due to its nature affecting USB networking in the Linux kernel.
How do I fix CVE-2025-21742?
To fix CVE-2025-21742, users should update their Linux kernel to the latest versions where this vulnerability is patched.
What are the potential impacts of CVE-2025-21742?
CVE-2025-21742 can potentially lead to denial-of-service conditions or compromise the integrity of USB network connections.
Which versions of the Linux kernel are affected by CVE-2025-21742?
CVE-2025-21742 affects various versions of the Linux kernel that utilize the usbnet and ipheth drivers.
Is CVE-2025-21742 actively exploited in the wild?
As of now, there are no confirmed reports of CVE-2025-21742 being actively exploited in the wild.