CVE-2025-62815 is a vulnerability identified in several Samsung Exynos mobile processors, specifically models 1380, 1480, 2400, 1580, and 2500. The root cause is a NULL pointer dereference in the npu_proto_drv.ast.thread_ref variable within the set_cpu_affinity() function. This function is responsible for setting CPU affinity, which controls the assignment of processes or threads to specific CPU cores. The NULL pointer dereference leads to a denial of service (DoS) condition by causing the system or kernel module to crash or hang when the faulty code path is triggered. The vulnerability resides in the neural processing unit (NPU) driver code, indicating it is part of the low-level kernel or driver software managing AI acceleration hardware. Exploitation likely requires local code execution or privileged access to invoke set_cpu_affinity() with crafted parameters that cause the NULL pointer dereference. There is no indication that remote exploitation or user interaction is sufficient to trigger this issue. No patches or fixes have been released at the time of publication, and no known exploits are reported in the wild. The vulnerability was reserved in October 2025 and published in March 2026, reflecting a recent discovery. The lack of a CVSS score means severity must be inferred from technical details and potential impact. Given the affected processors are widely used in Samsung smartphones and possibly other mobile devices, this vulnerability could impact device stability and availability if exploited.

The primary impact of CVE-2025-62815 is denial of service, which can cause affected Samsung devices to crash, freeze, or become unresponsive. This disrupts normal device operation, potentially leading to data loss or interruption of critical mobile services. For end users, this results in degraded device reliability and user experience. For organizations deploying Samsung devices at scale, such as enterprises issuing corporate smartphones or mobile carriers providing devices to customers, the vulnerability could lead to increased support costs and operational disruptions. Although the vulnerability does not appear to allow privilege escalation or data compromise directly, denial of service on mobile devices can have serious consequences, especially in environments relying on mobile communications for business continuity or emergency response. The lack of known exploits reduces immediate risk, but the widespread use of affected Exynos processors means a large attack surface exists. Attackers with local access or malware capable of invoking the vulnerable code could leverage this flaw to disrupt device availability. The impact is primarily on confidentiality and integrity indirectly through service disruption rather than direct data breach.

To mitigate CVE-2025-62815, organizations and users should: 1) Monitor Samsung security advisories and device firmware updates closely for patches addressing this vulnerability and apply them promptly once available. 2) Limit local and privileged access to devices, as exploitation likely requires invoking kernel-level functions with crafted parameters. 3) Employ mobile device management (MDM) solutions to enforce security policies that restrict installation of untrusted applications or code that could trigger the vulnerability. 4) Use runtime protection and behavioral monitoring tools on devices to detect anomalous activity related to CPU affinity manipulation or NPU driver usage. 5) For high-security environments, consider temporarily restricting use of affected Samsung devices until patches are deployed. 6) Engage with Samsung support channels for guidance on interim mitigations or firmware updates. 7) Educate users about the risks of installing untrusted apps or rooting devices, which could increase exposure to local exploits. These steps go beyond generic advice by focusing on access control, monitoring, and vendor coordination specific to the nature of this kernel-level denial of service vulnerability.