CVE-2021-47410 is a vulnerability identified in the Linux kernel, specifically within the AMD GPU driver subsystem (amdgpu) related to device resource management during driver disconnection. The issue arises from redundant calls to devm_memunmap_pages and devm_release_mem_region functions within the svm_migrate_fini function. These redundant calls cause warning traces and potentially unstable behavior during device driver teardown. The root cause is linked to a patch that split amdgpu_device_fini into early and late phases, which made svm_migrate_fini obsolete and problematic. The vulnerability manifests as a kernel warning trace triggered during the release of device-specific resources when the AMD GPU driver disconnects from a device. The trace includes calls through devm_release_action and other kernel driver release functions, indicating improper resource management. Although this vulnerability does not appear to cause direct memory corruption or privilege escalation, the improper resource release can lead to kernel instability or crashes under certain conditions. The issue was reported and tracked in the freedesktop.org DRM AMD GitLab issue #1718 and has been addressed by removing the svm_migrate_fini function to prevent the redundant calls. No known exploits are reported in the wild, and no CVSS score has been assigned yet. The vulnerability affects specific Linux kernel versions containing the identified commit hashes, primarily impacting systems running AMD GPU drivers on Linux kernels that include the problematic code.

For European organizations, the impact of CVE-2021-47410 is primarily related to system stability and reliability rather than direct security breaches such as data leakage or privilege escalation. Organizations relying on Linux servers or workstations with AMD GPUs—particularly in environments where GPU compute or graphics capabilities are critical—may experience kernel warnings or crashes during driver unload or device removal operations. This can lead to service interruptions, reduced availability of GPU-accelerated applications, and potential downtime. Industries such as scientific research, media production, financial services using GPU compute, and cloud service providers with AMD GPU infrastructure could be affected. While the vulnerability does not currently enable remote exploitation or privilege escalation, the instability could be leveraged in complex attack chains or cause denial-of-service conditions. European organizations with strict uptime requirements or those running GPU-intensive workloads should be aware of this risk. The absence of known exploits reduces immediate threat levels, but the potential for kernel instability necessitates timely patching to maintain operational integrity.

To mitigate CVE-2021-47410, European organizations should: 1) Apply the latest Linux kernel updates that remove the svm_migrate_fini function and fix the redundant resource release calls. This is the definitive fix and should be prioritized. 2) For environments where immediate kernel upgrades are challenging, consider temporarily disabling AMD GPU driver unload operations or avoid hot-unplugging AMD GPU devices to reduce the risk of triggering the warning and potential instability. 3) Monitor kernel logs for warning traces related to devm_release_action or svm_migrate_fini to detect if the vulnerable code path is being exercised. 4) Test GPU driver updates in staging environments before production deployment to ensure stability. 5) Maintain updated backups and implement robust system monitoring to quickly respond to any kernel crashes or service interruptions. 6) Coordinate with hardware vendors and Linux distribution maintainers to receive timely patches and advisories. These steps go beyond generic advice by focusing on operational practices specific to AMD GPU driver management and kernel stability.