CVE-2026-79976 NULL pointer dereference in the MCTP I2C+GPIO target binding triggerable by a peer I2C controller

The MCTP-over-I2C+GPIO target binding in subsys/pmci/mctp/mctpi2cgpiotarget.c emulates a small pseudo-register file, where the bus controller first writes a register number and then writes or reads payload bytes. The selected register b-regaddr and the data-phase flag b-rxtx were never cleared wh...

CVE-2026-79976

The MCTP-over-I2C+GPIO target binding in subsys/pmci/mctp/mctp_i2c_gpio_target.c is vulnerable to a NULL pointer dereference because the b->reg_addr and b->rxtx flags are not cleared when an I2C STOP is issued. This allows a controller on the shared management bus to re-enter mctp_i2c_gpio_...