kernel: when setting font with malicious data by ioctl PIO_FONT, kernel will write memory out of bounds

An out-of-bounds write flaw was found in the Linux kernel’s console driver functionality in the way a user triggers the ioctl PIOFONT with malicious data. This flaw allows a local user to crash or potentially escalate their privileges on the system...

UBUNTU-CVE-2021-33656

When setting font with malicous data by ioctl cmd PIOFONT,kernel will write memory out of bounds...