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...

OESA-2022-1748 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: Using the ioctl function to modify the vcfont.height value through PIOFONT can cause the KASAN: vmalloc-out-of-bounds in sysimageblit problem. Requires tty group permissions to access the device file /dev/tty1.CVE-2021-33656...