CVE-2025-37766 is a vulnerability identified in the Linux kernel specifically within the Direct Rendering Manager (DRM) AMD power management (pm) component. The flaw arises due to improper handling of a user-controlled speed value. The vulnerability allows a user to set an arbitrary speed value, and if this value exceeds UINT_MAX/8, it triggers a division by zero error. This is a classic example of insufficient input validation leading to an arithmetic error. The division by zero can cause the kernel module to crash or behave unpredictably, potentially leading to a denial of service (DoS) condition. Since this vulnerability is located in the kernel's DRM AMD power management code, it affects systems running Linux kernels with AMD GPU support. The flaw was discovered by the Linux Verification Center using static analysis tools (SVACE). There are no known exploits in the wild at the time of publication, and no CVSS score has been assigned yet. The vulnerability was published on May 1, 2025, and affects multiple versions of the Linux kernel as indicated by the repeated commit hashes. The issue has been resolved by preventing the division by zero through proper validation of the speed parameter before performing arithmetic operations.

For European organizations, the impact of CVE-2025-37766 primarily revolves around potential system instability and denial of service. Systems running Linux with AMD GPU drivers that are vulnerable could experience kernel crashes or reboots if an attacker or malicious user triggers the division by zero condition. This could disrupt critical services, especially in environments relying on Linux servers or workstations with AMD GPUs for graphical processing or compute tasks. While this vulnerability does not appear to allow privilege escalation or remote code execution, the DoS impact could affect availability of services, which is critical in sectors such as finance, healthcare, manufacturing, and public administration. Organizations using Linux-based infrastructure with AMD GPUs should be aware that insider threats or local attackers with the ability to set speed values could exploit this vulnerability. The lack of known exploits in the wild reduces immediate risk but does not eliminate the need for timely patching. Given the kernel-level nature of the vulnerability, any crash could also lead to data loss or corruption if occurring during critical operations.

To mitigate CVE-2025-37766, European organizations should: 1) Apply the latest Linux kernel patches that address this vulnerability as soon as they become available. Monitor Linux kernel mailing lists and vendor advisories for updates. 2) Restrict access to systems with AMD GPUs to trusted users only, minimizing the risk of malicious or accidental triggering of the vulnerability. 3) Implement kernel lockdown or mandatory access controls (e.g., SELinux, AppArmor) to limit the ability of unprivileged users to interact with DRM AMD power management interfaces. 4) Monitor system logs for any unusual crashes or kernel oops messages related to DRM or AMD GPU drivers, which could indicate attempted exploitation. 5) For critical systems, consider temporarily disabling or limiting AMD GPU power management features if patching is delayed, to reduce attack surface. 6) Conduct internal audits to identify Linux systems with AMD GPUs and ensure they are prioritized for patching and monitoring. 7) Educate system administrators about this vulnerability and the importance of applying kernel updates promptly.