'ROS - Buffer Overflow Error - How is chmod 666 command solving it?

I am working on a project based on the Lidar usage on ROS. I was getting Buffer Overflow Detected error and I saw that it is a common problem that can be solved easily with

sudo chmod 666 /dev/ttyUSB0

command.

But I could not understand how and why this permission solves this problem. Can you explain it in detail?

ubunturosbuffer-overflowlidar


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