Shannon Baseband NrmmMsgCodec Access Category Definitions Heap Buffer Overflow

There is a heap buffer overflow in Shannon Baseband, inside the 5G MM protocol implementation (NrmmMsgCodec as it is called in Shannon according to debug strings), specifically when handling the Operator-defined access category definitions message (IEI = 0x76).

access baseband buffer buffer overflow called debug defined handling heap buffer overflow message overflow protocol strings