CVE-2020-28974

Una lectura fuera de límites en fbcon en el kernel de Linux versiones anteriores a 5.9.7, podría ser usada por parte de atacantes locales para leer información privilegiada o potencialmente bloquear el kernel, también se conoce como CID-3c4e0dff2095. Esto ocurre porque la función KD_FONT_OP_COPY en el archivo drivers/tty/vt/vt.c puede ser usada para manipulaciones tales como la altura de la fuente

An out-of-bounds (OOB) SLAB memory access flaw was found in the Linux kernel's fbcon driver module. A bounds check failure allows a local attacker with special user privileges to gain access to out-of-bounds memory, leading to a system crash or leaking of internal kernel information. The highest threat from this vulnerability is to system availability.

It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information. Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information. Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.