Vulnerability CVE-2021-47024
Published: 2024-02-28

Description:
In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: free queued packets when closing socket

As reported by syzbot [1], there is a memory leak while closing the
socket. We partially solved this issue with commit ac03046ece2b
("vsock/virtio: free packets during the socket release"), but we
forgot to drain the RX queue when the socket is definitely closed by
the scheduled work.

To avoid future issues, let's use the new virtio_transport_remove_sock()
to drain the RX queue before removing the socket from the af_vsock lists
calling vsock_remove_sock().

[1] https://syzkaller.appspot.com/bug?extid=24452624fc4c571eedd9

 References:
https://git.kernel.org/stable/c/b605673b523fe33abeafb2136759bcbc9c1e6ebf
https://git.kernel.org/stable/c/27691665145e74a45034a9dccf1150cf1894763a
https://git.kernel.org/stable/c/37c38674ef2f8d7e8629e5d433c37d6c1273d16b
https://git.kernel.org/stable/c/8432b8114957235f42e070a16118a7f750de9d39
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