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Vulnerability record · CVE-2020-25637 · published 6 October 2020

CVE-2020-25637: Redhat libvirt double free vulnerability

Redhat · Libvirt

A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

6.7 CVSS 3.1 Medium EPSS 0.53% · top 57.6% CWE-415 · Double free
6.7CVSS 3.1 base score, v2 7.2
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00072.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00073.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1881037 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.gentoo.org/glsa/202210-06 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00072.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00073.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1881037 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.gentoo.org/glsa/202210-06 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25637), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.