mii_write (struct net_device *dev, int phy_addr, int reg_num, u16 data)
{
	u32 cmd;

	/* Preamble */
	mii_send_bits (dev, 0xffffffff, 32);
	/* ST(2), OP(2), ADDR(5), REG#(5), TA(2), Data(16) total 32 bits */
	/* ST,OP,AAAAA,RRRRR,TA = 0101xxxxxxxxxx10'b = 0x5002 for write */
	cmd = (0x5002 << 16) | (phy_addr << 23) | (reg_num << 18) | data;
	mii_send_bits (dev, cmd, 32);
	/* End cycle */
	mii_getbit (dev);
	return 0;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.