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CVE-2021-20181

Published: 1 February 2021

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.35)
focal
Released (1:4.2-3ubuntu6.12)
groovy
Released (1:5.0-5ubuntu9.4)
hirsute
Released (1:5.2+dfsg-6ubuntu2)
xenial
Released (1:2.5+dfsg-5ubuntu10.49)
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)
trusty Needed

upstream Needs triage

mantic
Released (1:5.2+dfsg-6ubuntu2)
Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=89fbea8737e8f7b954745a1ffc4238d377055305
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

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H