Memory Corruption in Linux Kernel DRM Exynos VIDI

Executive Summary

This vulnerability exists in the Linux kernel's drm/exynos driver, specifically in the vidi_connection_ioctl() function. The issue arises because a user pointer (vidi->edid) is directly dereferenced in kernel space without proper validation or copying.

Directly dereferencing a user pointer in the kernel can lead to arbitrary kernel memory access from user space, which is a serious security risk. The fix involves copying the data from user space to kernel space using the safe copy_from_user() function before accessing it.

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Impact Analysis

This vulnerability allows an attacker to gain arbitrary access to kernel memory from user space. Such access can lead to privilege escalation, unauthorized data access, system crashes, or other malicious activities that compromise the security and stability of the affected system.

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Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the drm/exynos vidi driver no longer directly dereferences user pointers. The fix involves modifying vidi_connection_ioctl() to safely copy the edid data from user space to kernel space using copy_from_user() instead of direct dereferencing.

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