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Vulnerability record · CVE-2020-14339 · published 3 December 2020

CVE-2020-14339: Redhat libvirt vulnerability

Redhat · Libvirt

A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process. This file descriptor allows for privileged operations to happen against the device-mapper on the host. This flaw allows a malicious guest user or process to perform operations outside of their standard permissions, potentially causing serious damage to the host operating system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

8.8 CVSS 3.1 High EPSS 0.42% · top 66.1% CWE-772 · CWE-772
8.8CVSS 3.1 base score, v2 7.2
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process. This file descriptor allows for privileged operations to happen against the device-mapper on the host. This flaw allows a malicious guest user or process to perform operations outside of their standard permissions, potentially causing serious damage to the host operating system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1860069 Issue TrackingPatchThird Party Advisory
https://security.gentoo.org/glsa/202101-22 Third Party Advisory
https://security.gentoo.org/glsa/202210-06 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1860069 Issue TrackingPatchThird Party Advisory
https://security.gentoo.org/glsa/202101-22 Third Party Advisory
https://security.gentoo.org/glsa/202210-06 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-14339), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.