CVE-2024-50268 is a vulnerability identified in the Linux kernel's USB Type-C (typec) subsystem, specifically within the function ucsi_ccg_update_set_new_cam_cmd(). The vulnerability arises due to a potential out-of-bounds write condition. The root cause is that the "*cmd" variable, which is user-controllable via debugfs, can be set to a value as high as 255. This value is then used as an index for the "new_cam" variable, which is subsequently used to access the uc->updated[] array. However, the size of this array is limited to UCSI_MAX_ALTMODES, which is defined as 30. This discrepancy allows for an out-of-bounds write when the index exceeds the array bounds. The call chain leading to this vulnerability starts from ucsi_cmd(), which receives input from simple_attr_write_xsigned(), and proceeds through ucsi_send_command(), ucsi_send_command_common(), ucsi_run_command(), and finally ucsi_ccg_sync_control(), where the out-of-bounds access occurs. Since the "*cmd" variable is user-controllable via debugfs, an unprivileged local user with access to debugfs can potentially exploit this vulnerability to corrupt kernel memory. This could lead to system instability, crashes (denial of service), or potentially privilege escalation if exploited with additional techniques. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet. The vulnerability affects Linux kernel versions identified by the commit hash 170a6726d0e266f2c8f306e3d61715c32f4ee41e, indicating a specific code state rather than a broad version range. The vulnerability was published on November 19, 2024, and was reserved on October 21, 2024.

For European organizations, the impact of CVE-2024-50268 can be significant, especially for those relying heavily on Linux-based infrastructure and devices that utilize USB Type-C interfaces. The vulnerability allows local users with debugfs access to perform out-of-bounds writes in kernel memory, which can lead to system crashes or potentially privilege escalation. This could disrupt critical services, cause downtime, and compromise system integrity. Organizations in sectors such as finance, healthcare, telecommunications, and government, which often use Linux servers and embedded devices, may face increased risk. Additionally, industrial control systems and IoT devices running Linux kernels with USB Type-C support could be affected, potentially impacting operational technology environments. Although exploitation requires local access and debugfs availability, many Linux distributions mount debugfs by default or allow easy mounting, increasing the attack surface. The absence of known exploits in the wild currently reduces immediate risk, but the vulnerability's presence in a widely used kernel component means that targeted attacks or insider threats could leverage it. The impact on confidentiality, integrity, and availability is medium to high depending on the attacker's capabilities and environment configuration.

To mitigate CVE-2024-50268, European organizations should take the following specific actions: 1) Apply the official Linux kernel patches that address this vulnerability as soon as they become available. Monitor kernel mailing lists and vendor advisories for updates referencing this CVE. 2) Restrict access to debugfs, especially on multi-user systems. Unmount debugfs where it is not required or restrict its permissions to trusted administrators only. 3) Implement strict local user access controls and auditing to detect unauthorized attempts to write to debugfs files. 4) For embedded and IoT devices, ensure firmware and kernel updates include this fix, and disable debugfs if not needed. 5) Conduct vulnerability scanning and configuration audits to identify systems with exposed debugfs mounts. 6) Employ kernel hardening techniques such as SELinux or AppArmor policies to limit the ability of local users to interact with kernel debug interfaces. 7) Educate system administrators about the risks of exposing debugfs and the importance of timely patching. These measures go beyond generic advice by focusing on controlling debugfs exposure and prioritizing patch management in Linux environments.