CVE-2024-56757 is a vulnerability identified in the Linux kernel's Bluetooth USB driver, specifically affecting the MediaTek USB interface used for ISO data transmission. The issue arises because the MediaTek Bluetooth USB dongle uses a special USB interrupt interface that must be properly released before the Host Controller Interface (HCI) device is unregistered during USB disconnection. Failure to release this interface correctly can lead to a kernel panic when the HCI device is unregistered. This vulnerability is rooted in improper resource management during device removal, which can cause the kernel to crash, resulting in a denial of service (DoS) condition. The vulnerability affects Linux kernel versions identified by the commit hash 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, and the issue has been resolved by adding the appropriate interface release flow during USB disconnect events. There are no known exploits in the wild at this time, and no CVSS score has been assigned yet. The vulnerability is specific to systems using MediaTek Bluetooth USB dongles that rely on this particular USB interrupt interface for ISO data transmission, which is a specialized use case within Linux Bluetooth USB support.

For European organizations, the primary impact of this vulnerability is the potential for denial of service due to kernel panics triggered by the improper removal of MediaTek Bluetooth USB dongles. This can affect systems that rely on Bluetooth connectivity for critical operations, including industrial control systems, healthcare devices, and enterprise IT infrastructure that use Linux-based systems with MediaTek Bluetooth hardware. The kernel panic could lead to system crashes, service interruptions, and potential data loss if systems are not properly shut down. While this vulnerability does not directly expose confidentiality or integrity risks, the availability impact can disrupt business operations, especially in environments where Bluetooth devices are integral to workflows or security mechanisms (e.g., Bluetooth-based authentication or device management). The lack of known exploits reduces immediate risk, but the vulnerability should be addressed proactively to avoid potential exploitation or accidental triggering in operational environments.

To mitigate this vulnerability, European organizations should: 1) Apply the latest Linux kernel updates that include the patch for CVE-2024-56757 as soon as they become available from their Linux distribution vendors. 2) Implement strict device management policies to avoid hot-plugging or removing MediaTek Bluetooth USB dongles without proper shutdown procedures until patches are applied. 3) Monitor system logs for kernel panic events related to Bluetooth USB devices to detect potential triggering of this issue. 4) For critical systems, consider disabling or restricting the use of MediaTek Bluetooth USB dongles if they are not essential, or replace them with hardware not affected by this vulnerability. 5) Engage with hardware vendors to confirm the use of affected MediaTek Bluetooth USB devices and ensure firmware and driver compatibility with patched kernels. 6) Incorporate this vulnerability into vulnerability management and patching cycles to ensure timely remediation and reduce operational risk.