The qemu-nbd server in QEMU (aka Quick Emulator), when built with the Network Block Device (NBD) Server support, allows remote attackers to cause a denial of service (segmentation fault and server crash) by leveraging failure to ensure that all initialization occurs before talking to a client in the nbd_negotiate function.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.9.1"
},
{
"introduced": "0"
},
{
"last_affected": "9.0"
}
]
}