CVE-2021-20196

Published: 26 May 2021

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Priority

CVSS 3 base score: 6.5

Status

Package	Release	Status
qemu Launchpad, Ubuntu, Debian	Upstream	Needs triage

	Ubuntu 21.04 (Hirsute Hippo)	Deferred (2021-06-09)
	Ubuntu 20.10 (Groovy Gorilla)	Deferred (2021-06-09)
	Ubuntu 20.04 LTS (Focal Fossa)	Deferred (2021-06-09)
	Ubuntu 18.04 LTS (Bionic Beaver)	Deferred (2021-06-09)
	Ubuntu 16.04 ESM (Xenial Xerus)	Deferred (2021-06-09)
	Ubuntu 14.04 ESM (Trusty Tahr)	Deferred (2021-06-09)
qemu-kvm Launchpad, Ubuntu, Debian	Upstream	Needs triage

	Ubuntu 21.04 (Hirsute Hippo)	Does not exist
	Ubuntu 20.10 (Groovy Gorilla)	Does not exist
	Ubuntu 20.04 LTS (Focal Fossa)	Does not exist
	Ubuntu 18.04 LTS (Bionic Beaver)	Does not exist
	Ubuntu 16.04 ESM (Xenial Xerus)	Does not exist
	Ubuntu 14.04 ESM (Trusty Tahr)	Does not exist
xen Launchpad, Ubuntu, Debian	Upstream	Needs triage

	Ubuntu 21.04 (Hirsute Hippo)	Needs triage
	Ubuntu 20.10 (Groovy Gorilla)	Needs triage
	Ubuntu 20.04 LTS (Focal Fossa)	Needs triage
	Ubuntu 18.04 LTS (Bionic Beaver)	Needs triage
	Ubuntu 16.04 ESM (Xenial Xerus)	Needs triage
	Ubuntu 14.04 ESM (Trusty Tahr)	Does not exist
	Binaries built from this source package are in Universe and so are supported by the community.

Notes

Author	Note
mdeslaur	as of 2021-06-09, proposed patch has not been commited upstream

CVE-2021-20196

Low

Status

Notes

References

Bugs

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