CVE-2021-20181

Publication date 1 February 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
qemu 24.10 oracular
Fixed 1:5.2+dfsg-6ubuntu2
24.04 LTS noble
Fixed 1:5.2+dfsg-6ubuntu2
23.10 mantic
Fixed 1:5.2+dfsg-6ubuntu2
23.04 lunar
Fixed 1:5.2+dfsg-6ubuntu2
22.10 kinetic
Fixed 1:5.2+dfsg-6ubuntu2
22.04 LTS jammy
Fixed 1:5.2+dfsg-6ubuntu2
21.10 impish
Fixed 1:5.2+dfsg-6ubuntu2
21.04 hirsute
Fixed 1:5.2+dfsg-6ubuntu2
20.10 groovy
Fixed 1:5.0-5ubuntu9.4
20.04 LTS focal
Fixed 1:4.2-3ubuntu6.12
18.04 LTS bionic
Fixed 1:2.11+dfsg-1ubuntu7.35
16.04 LTS xenial
Fixed 1:2.5+dfsg-5ubuntu10.49
14.04 LTS trusty Ignored end of ESM support, was needed
qemu-kvm 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

Patch details

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

Package Patch details
qemu

Severity score breakdown

Parameter Value
Base score 7.5 · High
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

References

Related Ubuntu Security Notices (USN)

Other references