CVE-2024-47662 is a vulnerability identified in the Linux kernel, specifically within the Direct Rendering Manager (DRM) subsystem for AMD graphics hardware. The issue pertains to the DCN35 (Display Core Next 3.5) component's DMCUB (Display Microcontroller Unit B) diagnostic collection process. The vulnerability arises because certain registers, which should not be accessed by the driver, were being read during diagnostic data collection. This improper register access triggers a security violation when the DMCUB work times out, which subsequently blocks the Z8 entry—a critical step in the diagnostic or operational workflow of the display controller. The root cause is the reading of these restricted registers, which is not intended behavior and leads to a security violation state. The fix involves removing the register read operation from the DCN35 driver code, thereby preventing the security violation and ensuring the diagnostic collection process does not interfere with the system's normal operation or security posture. This vulnerability is specific to the Linux kernel's AMD DRM driver implementation and affects versions identified by the given commit hashes. There are no known exploits in the wild at the time of publication, and no CVSS score has been assigned yet. The vulnerability is technical and low-level, affecting the interaction between the kernel driver and AMD display hardware diagnostics.

For European organizations, the impact of CVE-2024-47662 is primarily relevant to those using Linux systems with AMD graphics hardware, particularly in environments where the DRM subsystem is critical for display management, such as workstations, servers with GPU acceleration, or embedded systems. The security violation triggered by this vulnerability could potentially lead to denial of service conditions by blocking diagnostic operations or causing instability in the display subsystem. While there is no direct evidence of data breach or privilege escalation, the disruption of diagnostic processes may hinder system monitoring and troubleshooting, which can affect operational continuity. In sectors like finance, healthcare, or critical infrastructure where Linux-based systems with AMD GPUs are deployed, this could translate into reduced system reliability or delayed incident response. However, since the vulnerability requires specific hardware and driver conditions and no active exploits are known, the immediate risk is moderate. The vulnerability also highlights the importance of timely kernel updates to maintain system integrity and avoid subtle hardware-driver interaction issues that could escalate under certain conditions.

European organizations should prioritize updating their Linux kernel to the patched version that removes the problematic register read in the DCN35 AMD DRM driver. This update should be applied promptly to all systems using AMD graphics hardware with the affected Linux kernel versions. System administrators should verify the kernel version and AMD driver status, and test the update in controlled environments before widespread deployment to avoid unexpected disruptions. Additionally, organizations should monitor kernel security advisories and AMD driver updates closely for any further patches or related vulnerabilities. For environments where kernel updates are challenging, consider isolating or limiting the use of affected AMD hardware or disabling diagnostic features that trigger the vulnerability, if feasible. Implementing robust monitoring for system stability and diagnostic failures can help detect any issues arising from this vulnerability. Finally, maintain a comprehensive patch management policy that includes Linux kernel and driver updates to reduce exposure to similar hardware-driver interaction vulnerabilities.