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CVE-2021-20221

Published: 13 May 2021

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Priority

Low

Cvss 3 Severity Score

6.0

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.37)
focal
Released (1:4.2-3ubuntu6.17)
groovy
Released (1:5.0-5ubuntu9.9)
hirsute
Released (1:5.2+dfsg-6ubuntu2)
impish
Released (1:5.2+dfsg-6ubuntu2)
jammy
Released (1:5.2+dfsg-6ubuntu2)
kinetic
Released (1:5.2+dfsg-6ubuntu2)
lunar
Released (1:5.2+dfsg-6ubuntu2)
mantic
Released (1:5.2+dfsg-6ubuntu2)
trusty Needed

upstream Needs triage

xenial Needed

Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=edfe2eb4360cde4ed5d95bda7777edcb3510f76a
qemu-kvm
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

trusty Does not exist

upstream Needs triage

xenial 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