In the Linux kernel, the following vulnerability has been resolved:
virtio-pci: Check if is_avq is NULL
[bug] In the virtiopcicommon.c function vpdelvqs, vpdev->isavq is involved to determine whether it is admin virtqueue, but this function vpdev->isavq may be empty. For installations, virtiopcilegacy does not assign a value to vpdev->isavq.
[fix] Check whether it is vpdev->isavq before use.
[test] Test with virsh Attach device Before this patch, the following command would crash the guest system
After applying the patch, everything seems to be working fine.