CVE-2025-58476 is a medium-severity security vulnerability classified as an out-of-bounds read (CWE-125) in the bootloader component of Samsung Mobile devices. The bootloader is a critical low-level software that initializes device hardware and loads the operating system. This vulnerability exists in devices prior to the SMR (Security Maintenance Release) December 2025 Release 1 update. An out-of-bounds read occurs when the bootloader reads memory beyond the allocated buffer limits, which can lead to disclosure of sensitive information stored in adjacent memory regions. The vulnerability requires physical access to the device, has high attack complexity, and does not require any privileges or user interaction, making remote exploitation infeasible. The CVSS v3.1 vector (AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) indicates that confidentiality is impacted with a high impact, while integrity and availability remain unaffected. No public exploits or active exploitation have been reported to date. The lack of patch links suggests the fix is included in the upcoming SMR December 2025 Release 1. This vulnerability could be leveraged by attackers with physical access to extract sensitive data from the device’s memory, potentially compromising user privacy or leaking cryptographic keys and credentials stored in bootloader memory regions.

For European organizations, the primary impact is the potential exposure of sensitive information stored in Samsung Mobile devices’ bootloader memory if an attacker gains physical access. This could lead to data breaches involving confidential corporate or personal data, intellectual property, or cryptographic material. Although the vulnerability does not affect device integrity or availability, the confidentiality breach could undermine trust in mobile device security, especially for sectors handling sensitive information such as finance, government, healthcare, and critical infrastructure. The requirement for physical access limits the threat to scenarios involving device theft, loss, or insider threats. However, given the widespread use of Samsung devices across Europe, even limited exploitation could have significant privacy and compliance implications under GDPR and other data protection regulations.

1. Deploy the SMR December 2025 Release 1 update on all affected Samsung Mobile devices as soon as it becomes available to patch the vulnerability. 2. Enforce strict physical security policies to prevent unauthorized access to devices, including secure storage, device tracking, and rapid reporting of lost or stolen devices. 3. Implement full-disk encryption and strong device authentication mechanisms to reduce the risk of data exposure even if physical access is obtained. 4. Conduct regular security awareness training for employees about the risks of device theft and the importance of safeguarding mobile devices. 5. For highly sensitive environments, consider additional hardware-based protections such as secure boot and trusted execution environments that limit bootloader memory exposure. 6. Monitor for any emerging exploit attempts or proof-of-concept code in threat intelligence feeds to respond promptly if exploitation in the wild is detected.