CVE-2021-4207

Publication date 29 April 2022

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	24.04 LTS noble	Fixed 1:6.2+dfsg-2ubuntu8
	23.10 mantic	Fixed 1:6.2+dfsg-2ubuntu8
	23.04 lunar	Fixed 1:6.2+dfsg-2ubuntu8
	22.10 kinetic	Fixed 1:6.2+dfsg-2ubuntu8
	22.04 LTS jammy	Fixed 1:6.2+dfsg-2ubuntu6.2
	21.10 impish	Fixed 1:6.0+dfsg-2expubuntu1.3
	20.04 LTS focal	Fixed 1:4.2-3ubuntu6.23
	18.04 LTS bionic	Fixed 1:2.11+dfsg-1ubuntu7.40
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
qemu	Upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895

Severity score breakdown

Parameter	Value
Base score	8.2 · High
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5489-1
QEMU vulnerabilities
21 June 2022