{"cve":"CVE-2021-3631","nvd":{"published":"2022-03-02T23:15:08.677","modified":"2026-06-17T04:05:28.457","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","score":6.3},"cwes":["CWE-732"],"references":["https://access.redhat.com/errata/RHSA-2021:3631","https://bugzilla.redhat.com/show_bug.cgi?id=1977726","https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2","https://gitlab.com/libvirt/libvirt/-/issues/153","https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html"],"products":["netapp:ontap_select_deploy_administration_utility","redhat:enterprise_linux","redhat:libvirt","redhat:openshift_container_platform"],"source":"nvd","synced_at":"2026-10-19T21:28:04.509275555+00:00"},"epss":{"cve":"CVE-2021-3631","score":0.00493,"percentile":0.42378,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}