An information-leak flaw was found in the Linux kernel’s pcan USB driver. When a device using this driver connects to the system, the stack information is leaked to the CAN bus, a controller area network for automobiles. The highest threat with this vulnerability is breach of data confidentiality.

Mitigation

As the devices module will be auto-loaded when the USB CAN bus adapter is connected, its can be disabled by preventing the module from loading with the following instructions:

echo "install peak_usb /bin/true" >> /etc/modprobe.d/disable-peak-usb-canbus.conf

The system will need to be restarted if the peak_usb module is already loaded. In most circumstances, the kernel modules will be unable to be unloaded while any CAN bus interfaces are active and the protocol is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article <https://access.redhat.com/solutions/41278&gt; or contact Red Hat Global Support Services.