static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len)
{
	const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
	unsigned int len;

	len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len),
			GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
	return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.