CVE-2023-53090: 
Linux Kernel vulnerability analysis and mitigation

A vulnerability has been identified in the Linux kernel's drm/amdkfd subsystem (CVE-2023-53090). The issue involves an illegal memory access in the kfdwaitonevents() function, where the event field of the kfdevent_waiter structure is accessed without proper initialization, leading to potential system crashes (NVD).

The vulnerability occurs when the kfdeventwaiter structure is allocated by alloceventwaiters(), but the event field of the waiter structure remains uninitialized. When copyfromuser() fails in the kfdwaitonevents() function, it triggers exception handling to release the previously allocated memory of the waiter structure. During this process, the uninitialized event field is accessed in the freewaiters() function, resulting in illegal memory access and system crash (NVD, Debian Tracker).

The vulnerability can cause system crashes due to illegal memory access, as evidenced by the documented crash logs. This affects the stability and availability of systems using the affected Linux kernel versions (NVD).

The issue has been resolved by modifying the allocation process to use kcalloc, which ensures proper initialization of the structure. Additionally, redundant 0-initialization and loop condition checks have been removed as part of the fix (NVD).