QEMU (aka Quick Emulator), when built with the IDE disk and CD/DVD-ROM Emulator support, allows local guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process crash) by flushing an empty CDROM device drive.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2017-12809.json"