A NULL pointer dereference issue was found in the Floopy disk emulator of QEMU. It could occur while processing read/write ioport commands, if the selected Floopy drive is not initialised with a block device. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario. https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html CREATE(Triage):(User=admin) CVE-2021-20196 (https://nvd.nist.gov/vuln/detail/CVE-2021-20196)
