CVE-2026-53344

Unknown

Published: 01/07/2026(UTC)Translated: 02/07/2026(UTC)NVD NIST

Summary

In the Linux kernel pinctrl mcp23s08 driver, a NULL pointer dereference vulnerability occurs during probe. The issue is caused by uninitialized mcp->dev and mcp->addr fields before regmap_init, leading to a NULL pointer dereference during SPI read.

Risk Assessment

This vulnerability can cause a kernel panic when loading the driver, preventing the use of MCP23S08 devices and potentially leading to service unavailability.

Recommendation

Apply the Linux kernel patch that moves initialization of mcp->dev and mcp->addr before the mcp23s08_spi_regmap_init() call. Update to a kernel version containing the fix.

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init Regmap initialization triggers regcache_maple_populate() which attempts SPI read to populate cache. SPI read requires mcp->dev and mcp->addr to be set, without them, NULL pointer dereference occurs during probe. Move initialization before mcp23s08_spi_regmap_init() call.