CVE-2020-14394

Description

An infinite loop flaw was found in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. This flaw allows a privileged guest user to hang the QEMU process on the host, resulting in a denial of service.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu-kvm	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
qemu	26.04 LTS resolute	Not affected
	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Fixed 1:6.2+dfsg-2ubuntu6.16
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Fixed 1:4.2-3ubuntu6.28
	18.04 LTS bionic	Fixed 1:2.11+dfsg-1ubuntu7.42+esm5
	16.04 LTS xenial	Fixed 1:2.5+dfsg-5ubuntu10.51+esm4
	14.04 LTS trusty	Fixed 2.0.0+dfsg-2ubuntu1.47+esm6

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Notes

mdeslaur

impact is limited, a privileged guest user can only use this issue to perform a denial of service to their own instance

Patch details

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

Package	Patch details
qemu	Other: https://lore.kernel.org/qemu-devel/20220802134834.454749-1-thuth@redhat.com/ Upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=effaf5a240e03020f4ae953e10b764622c3e87cc Upstream: effaf5a

Severity score breakdown

Parameter	Value
Base score	3.2 · Low
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-6567-1
QEMU vulnerabilities
8 January 2024

USN-8412-1
QEMU vulnerabilities
9 June 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2020-14394