CVE-2024-38215 is a high-severity elevation of privilege vulnerability affecting the Windows Cloud Files Mini Filter Driver in Microsoft Windows 11 Version 24H2 (build 10.0.26100.0). The root cause is an integer overflow or wraparound condition (classified under CWE-190) within the mini filter driver component responsible for managing cloud file synchronization and caching. This integer overflow can lead to improper handling of memory or data structures, potentially allowing a low-privileged local attacker with limited privileges (PR:L) to escalate their privileges to SYSTEM level without requiring user interaction (UI:N). The vulnerability has a CVSS v3.1 base score of 7.8, reflecting high impact on confidentiality, integrity, and availability (all rated high). The attack vector is local (AV:L), meaning the attacker must have some level of access to the system but can exploit the flaw without complex conditions or user involvement. The scope is unchanged (S:U), indicating the vulnerability affects only the vulnerable component and does not extend beyond the security boundary. No known exploits are currently reported in the wild, but the vulnerability is publicly disclosed and considered critical enough to warrant immediate attention. The lack of published patches at the time of disclosure increases the urgency for organizations to implement mitigations and monitor for updates. This vulnerability could be leveraged to gain unauthorized administrative control over affected Windows 11 systems, enabling attackers to install malware, exfiltrate data, or disrupt operations.

For European organizations, this vulnerability poses a significant risk, especially for enterprises and public sector entities using Windows 11 Version 24H2 in environments where local user accounts or less privileged users are present. Successful exploitation could lead to full system compromise, data breaches, and disruption of critical services. Organizations relying on cloud file synchronization features integrated with Windows 11 may be particularly exposed. The elevation of privilege could facilitate lateral movement within corporate networks, undermining endpoint security and potentially impacting confidentiality of sensitive data, integrity of systems, and availability of services. Given the widespread adoption of Windows 11 in Europe, especially in corporate and government sectors, the vulnerability could be exploited by insider threats or attackers who have gained limited initial access, amplifying the risk of impactful cyberattacks.

1. Immediately inventory and identify all systems running Windows 11 Version 24H2 (build 10.0.26100.0) within the organization. 2. Monitor official Microsoft channels for the release of security patches addressing CVE-2024-38215 and prioritize rapid deployment once available. 3. Until patches are released, restrict local user permissions to the minimum necessary, and limit the number of users with local access rights to reduce the attack surface. 4. Employ application control and endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of privilege escalation attempts. 5. Disable or restrict the use of Windows Cloud Files Mini Filter Driver features if feasible in critical environments to mitigate exposure. 6. Conduct user awareness training to minimize the risk of local account compromise that could lead to exploitation. 7. Implement network segmentation and strict access controls to limit lateral movement opportunities post-exploitation. 8. Regularly audit and review local accounts and privileges to ensure adherence to the principle of least privilege.