CVE-2026-53344

A flaw was found in the Linux kernel's pinctrl: mcp23s08 driver. During the initialization of the regmap (register map) for the mcp23s08 component, an attempt to perform an SPI (Serial Peripheral Interface) read occurs before critical device parameters (mcp->dev and mcp->addr) are properly set. This premature access leads to a NULL pointer dereference, which can cause a system crash and result in a Denial of Service (DoS).