CVE-2022-39842 Information

Description

An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c the count parameter has a type conflict of size_t versus int causing an integer overflow and bypassing the size check. After that because it is used as the third argument to copy_from_user() a heap overflow may occur.

Reference

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19 https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7