CVE-2026-90834

In the Zephyr RTOS , a vulnerability exists in the user-mode syscall verifiers for the 16-bit ("wide data") UART API located in drivers/serial/uart_handlers.c. The verifiers z_vrfy_uart_poll_out_u16(), z_vrfy_uart_tx_u16(), and z_vrfy_uart_rx_enable_u16() incorrectly validate 8-bit operations ins...