An issue was discovered in the Linux kernel 4.4 through 5.7.1.
drivers/tty/vt/keyboard.c has an integer overflow if k_ascii is called
several times in a row, aka CID-b86dab054059. NOTE: Members in the
community argue that the integer overflow does not lead to a security issue
in this case.

It was discovered that the Virtual Terminal keyboard driver in the Linux
kernel contained an integer overflow. A local attacker could possibly use
this to have an unspecified impact.

sbeattie

reproducer in lore.kernel.org link