cve 2025 68196

CVE-2025-68196 is a Linux kernel vulnerability affecting the AMD DRM display stack. It involves a race condition during link training (LT) automation where the display code could reference dc->current_state while calling into dc_update_planes_and_stream, potentially clobbering current_state and causing a kernel crash. The fix caches relevant stream pointers and iterates over that cached list instead of relying on the mutable current_state. This patch was applied in mid-December 2025. The tag covers discussions about this specific vulnerability, its impact on AMD display functionality, and the kernel patch that resolves it.