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So, it is best to wait until this commit gets through, and I hope that the Linux Kernel maintainers shed more light on it than we already know. 🤔 Of course, we aren't Linux Kernel maintainers.

Users seem confused about this move, considering many Android phones still use RNDIS instead of CDC NCM (a newer protocol) 😕 Not just users a Kernel Networking Developer at Google also flagged this issue, but we do not see a response to that yet.īut not everyone uses mainline Linux Kernel? Should you stick to an LTS version of the kernel if you do not want to be impacted by this change?įurthermore, users wanted more clarity on how this does not impact everyone.īut, as of now, Greg may not have mentioned a lot of details to convince some of the concerned users. If we look at a Reddit thread discussing this upcoming change, we would see that many users remain curious if this would break USB tethering for everyone. In addition, RNDIS is not being used as widely as before, and the security risks it presents might be one of the main reasons for this decision.ĭoes this have an impact on current users? Should you be worried? The implementation of RNDIS is known to be a mess on platforms apart from Windows and poses quite a few security risks. Windows only needed this for XP and newer systems, Windows systems older than that can use the normal USB class protocols instead, which do not have these problems.Īndroid has had this disabled for many years so there should not be anyĪs initially reported by Phoronix, once this protocol is marked 'BROKEN' in the Kconfig option, it will stay there for a while and ultimately be removed from the kernel. Protocol is impossible to make secure, just disable all rndis drivers to With the commit, he mentions: The Microsoft RNDIS protocol is, as designed, insecure and vulnerable onĪny system that uses it with untrusted hosts or devices. What is happening?: On Monday, Greg Kroah-Hartman created the usb.git rndis-removal branch, where he mentions disabling the implementation of all RNDIS protocol drivers on Linux.

The most common use case of this would be using your phone's mobile network to connect to the internet on your computer via USB, also known as Tethering.Įven though it mainly works on Windows, it has been part of the Linux kernel for a while now.īut that is set to change soon. Microsoft's RNDIS protocol, short for Remote Network Driver Interface Specification, is a proprietary USB protocol for virtual Ethernet functionality on computers.