vt: fix memory overlapping when deleting chars in the buffer
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.56 by commit 57964a5710252bc82fe22d9fa98c180c58c20244, it was introduced in version v3.7 by commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c. For more details please see the references link.