CVE-2023-52867: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-52867 is a buffer overflow vulnerability discovered in the Linux kernel's DRM (Direct Rendering Manager) Radeon driver. The vulnerability was identified in the HDMI audio interrupt handling for Evergreen GPUs, where a buffer 'afmtstatus' of size 6 could potentially overflow due to improper bounds checking of the 'afmtidx' index variable. The issue was discovered in August 2023 and fixed through a kernel patch (Kernel Patch).

The vulnerability exists in the drivers/gpu/drm/radeon/evergreen.c file where the index validation for 'afmtidx' was performed after accessing the 'afmtstatus' array. This could lead to a buffer overflow condition since the array has a fixed size of 6 elements. The issue stems from a code pattern introduced in commit 5cc4e5fc293b which handled HDMI audio interrupt handling for Evergreen GPUs (Kernel Patch).

The vulnerability could potentially lead to memory corruption due to buffer overflow, which might result in system crashes or potential security implications in the Linux kernel's Radeon driver subsystem (Red Hat CVE).

The vulnerability has been fixed through a kernel patch that reorders the bounds checking to occur before array access. The fix involves validating the 'afmtidx' value before performing any operations on the 'afmtstatus' array. Users are advised to update their Linux kernel to a version containing the fix (Kernel Patch).