> CVE-2021-25475: Kernel LPE in the Vision DSP Kernel Driver's ELF Linker

There is a vmalloc out of bounds write vulnerability in the vision DSP kernel driver of Samsung Exynos S20 devices. The vulnerability could potentially be used by a malicious system application to compromise the kernel and gain further privileges. Vulnerability Details The Exynos DSP driver implements two distinct ioctl calls that are used to load images and graphs and boot the device. The DSP_IOC_BOOT ioctl loads the dsp’s firmware images, common libraries, an xml global kernel descriptor file and a linker file for linking libraries. The DSP_IOC_LOAD_GRAPH ioctl is responsible for creating a shared memory region between the dsp device and user space and for loading the custom graph models implemented in elf libraries.