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Vulnerability record · CVE-2021-3631 · published 2 March 2022

CVE-2021-3631: Redhat libvirt incorrect permission assignment vulnerability

Redhat · Libvirt

A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.

6.3 CVSS 3.1 Medium EPSS 0.49% · top 60.1% CWE-732 · Incorrect permission assignment
6.3CVSS 3.1 base score, v2 3.3
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.

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

Affected products

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

References

LinkTags
https://access.redhat.com/errata/RHSA-2021:3631 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1977726 Issue TrackingVendor Advisory
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2 PatchThird Party Advisory
https://gitlab.com/libvirt/libvirt/-/issues/153 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.gentoo.org/glsa/202210-06 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220331-0010/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2021:3631 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1977726 Issue TrackingVendor Advisory
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2 PatchThird Party Advisory
https://gitlab.com/libvirt/libvirt/-/issues/153 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.gentoo.org/glsa/202210-06 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220331-0010/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3631), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.