CVE-2025-62815 is a vulnerability identified in multiple Samsung Exynos mobile processors (1380, 1480, 2400, 1580, and 2500). The issue stems from a NULL pointer dereference in the kernel driver component npu_proto_drv.ast.thread_ref within the set_cpu_affinity() function. This function is responsible for setting CPU affinity for threads, and the NULL pointer dereference leads to a denial of service by causing the system or affected process to crash or become unresponsive. The vulnerability is classified under CWE-476 (NULL Pointer Dereference), which typically results in program crashes or system instability. Exploitation requires local privileges (AV:L) and low attack complexity (AC:L), with no user interaction needed (UI:N). The scope is unchanged (S:U), and the impact affects availability only (A:H), with no impact on confidentiality or integrity. The vulnerability was reserved in October 2025 and published in March 2026. No patches or known exploits are currently available. The affected processors are widely used in Samsung smartphones and other mobile devices, making this a relevant concern for mobile device security. The denial of service could disrupt device operation, potentially impacting user experience and device reliability.

The primary impact of CVE-2025-62815 is denial of service, which can cause affected devices to crash or reboot unexpectedly. For end users, this results in loss of availability of the device, potentially interrupting critical communications or applications. For organizations deploying Samsung devices with these processors, especially in enterprise or industrial contexts, this could lead to operational disruptions. Although the vulnerability does not compromise confidentiality or integrity, repeated or targeted exploitation could degrade trust in device reliability. Since exploitation requires local privileges, attackers would need some level of access to the device, limiting remote exploitation risk. However, in environments where devices are shared or physically accessible, the risk increases. The lack of current patches means devices remain vulnerable until Samsung releases updates. The impact is more significant in regions with high Samsung device penetration or where these processors are prevalent in critical mobile infrastructure.

1. Monitor official Samsung security advisories and firmware update channels closely for patches addressing CVE-2025-62815 and apply them promptly once available. 2. Restrict local access to devices running affected Exynos processors to trusted users only, minimizing the risk of local exploitation. 3. Employ mobile device management (MDM) solutions to enforce security policies and monitor device health and stability. 4. Use runtime protection tools or kernel integrity monitoring to detect abnormal behavior indicative of exploitation attempts. 5. Educate users about the risks of granting local access or installing untrusted applications that could leverage local privileges. 6. For organizations deploying custom ROMs or kernels, review and harden the set_cpu_affinity() function and related driver code to prevent NULL pointer dereferences. 7. Consider network segmentation and limiting physical access to devices in sensitive environments to reduce attack surface. 8. Maintain regular backups of critical data to mitigate potential disruption caused by device crashes.