Linux: netback processing of zero-length transmit fragment

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The vulnerability of the `net_tx_pkt_add_raw_fragment` function in the `hw/net/net_tx_pkt.c` file of the QEMU hardware emulation software, related to the insufficient use of the `assert()` function, allows a hacker to trigger a system failure.

The vulnerability of the nettxpktaddrawfragment function in the hw/net/nettxpkt.c file of the QEMU hardware emulation software is related to the insufficient use of the assert function. Exploiting this vulnerability could allow an attacker to cause a system failure...