CVE-2025-61155 is a kernel-mode driver vulnerability found in Hotta Studio's GameDriverX64.sys version 7.23.4.7, an anti-cheat driver signed for Windows systems. The vulnerability arises from improper handling of IOCTL (Input Output Control) requests, which are used by user-mode applications to communicate with kernel-mode drivers. A local attacker with the ability to send crafted IOCTL requests to this driver can trigger a denial of service (DoS) condition by crashing arbitrary processes. This crash likely results from the driver failing to validate or sanitize input parameters properly, leading to memory corruption or invalid operations within kernel space. Because the driver operates at kernel level, such crashes can destabilize the system or critical processes, impacting availability. The attack requires local access, meaning an attacker must already have some level of access to the system to exploit the flaw. There is no indication that this vulnerability allows privilege escalation or remote code execution. No patches or mitigations have been published yet, and no exploits have been observed in the wild. The lack of a CVSS score means severity must be estimated based on impact and exploitability factors. The vulnerability primarily threatens system availability and stability rather than confidentiality or integrity.

For European organizations, the primary impact of CVE-2025-61155 is the potential for denial of service on systems running the vulnerable anti-cheat driver. This could disrupt gaming environments, software testing, or any applications relying on this driver, leading to operational downtime and productivity loss. In sectors where gaming or software development is significant, such as entertainment companies, e-sports organizations, or software vendors, this could affect service reliability and user experience. Although the vulnerability requires local access, insider threats or compromised user accounts could exploit it to cause targeted disruptions. The lack of remote exploitation limits widespread impact, but organizations with many endpoints running this driver may face increased risk of localized outages. Additionally, system instability caused by kernel crashes could lead to data loss or corruption if critical processes are affected. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially once exploit code becomes available.

To mitigate CVE-2025-61155, organizations should first identify all systems running the vulnerable GameDriverX64.sys driver version 7.23.4.7. Restrict local access to these systems by enforcing strict user privilege controls and limiting administrative rights to trusted personnel only. Monitor system logs and kernel driver activity for unusual or malformed IOCTL requests that could indicate exploitation attempts. Employ endpoint detection and response (EDR) solutions capable of detecting abnormal driver interactions. Until a vendor patch is released, consider disabling or uninstalling the affected anti-cheat driver if it is not critical to operations. Coordinate with Hotta Studio or the software vendor for updates and apply patches promptly once available. Additionally, implement robust endpoint security policies, including application whitelisting and integrity monitoring, to prevent unauthorized code execution or driver manipulation. Regularly back up critical data to minimize impact from potential system crashes.