The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, cor…

The eswifi socket offload driver in Zephyr RTOS contains a buffer overflow vulnerability (CWE-120) where user-provided payloads are copied into a fixed buffer without bounds checking. Oversized sends can overflow the eswifi->buf buffer, corrupting kernel memory. The vulnerability requires local access to exploit through the socket send API and cannot be exploited remotely. This represents a local privilege escalation or denial of service risk for systems running the affected Zephyr RTOS driver.