Use After Free Affecting qemu package, versions <1:2.5+dfsg-5ubuntu10.49


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.05% (20th percentile)

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  • Snyk IDSNYK-UBUNTU1604-QEMU-1066549
  • published2 Feb 2021
  • disclosed13 May 2021

Introduced: 2 Feb 2021

CVE-2021-20181  (opens in a new tab)
CWE-416  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 qemu to version 1:2.5+dfsg-5ubuntu10.49 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

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.

CVSS Scores

version 3.1