CVE-2021-3416

Published: 18 March 2021

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.

Priority

Cvss 3 Severity Score

6.0

Score breakdown

Status

Package	Release	Status
qemu Launchpad, Ubuntu, Debian	impish	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	jammy	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	kinetic	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	lunar	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	bionic	Released (1:2.11+dfsg-1ubuntu7.37)
	focal	Released (1:4.2-3ubuntu6.17)
	groovy	Released (1:5.0-5ubuntu9.9)
	hirsute	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	trusty	Needed
	upstream	Needs triage
	xenial	Needed
	mantic	Not vulnerable (1:5.2+dfsg-9ubuntu3)
	Patches: upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=705df5466c98f3efdd2b68d3b31dad86858acad7 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=1caff0340f49c93d535c6558a5138d20d475315c upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=331d2ac9ea307c990dc86e6493e8f0c48d14bb33 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=26194a58f4eb83c5bdf4061a1628508084450ba1 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=8c92060d3c0248bd4d515719a35922cd2391b9b4 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=8c552542b81e56ff532dd27ec6e5328954bdda73 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=5311fb805a4403bba024e83886fa0e7572265de4 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=99ccfaa1edafd79f7a3a0ff7b58ae4da7c514928 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=e73adfbeec9d4e008630c814759052ed945c3fed upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=37cee01784ff0df13e5209517e1b3594a5e792d1
qemu-kvm Launchpad, Ubuntu, Debian	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	trusty	Does not exist
	mantic	Does not exist

Severity score breakdown

Parameter	Value
Base score	6.0
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

References

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