CVE-2021-3416

2021-03-1800:00:00

ubuntu.com

cve-2021-3416

qemu

nic emulators

infinite loop

stack overflow

dos

cpu consumption

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

EPSS

0.001

Percentile

19.0%

JSON

A potential stack overflow via infinite loop issue was found in various NIC
emulators of QEMU in versions up to and including 5.2.0. The issue occurs
in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A
guest user/process may use this flaw to consume CPU cycles or crash the
QEMU process on the host resulting in DoS scenario.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchqemu< 1:2.11+dfsg-1ubuntu7.37UNKNOWN
ubuntu20.04noarchqemu< 1:4.2-3ubuntu6.17UNKNOWN
ubuntu20.10noarchqemu< 1:5.0-5ubuntu9.9UNKNOWN
ubuntu14.04noarchqemu< anyUNKNOWN
ubuntu16.04noarchqemu< anyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	qemu	< 1:2.11+dfsg-1ubuntu7.37	UNKNOWN
ubuntu	20.04	noarch	qemu	< 1:4.2-3ubuntu6.17	UNKNOWN
ubuntu	20.10	noarch	qemu	< 1:5.0-5ubuntu9.9	UNKNOWN
ubuntu	14.04	noarch	qemu	< any	UNKNOWN
ubuntu	16.04	noarch	qemu	< any	UNKNOWN