CVE-2021-3631
6.3
MEDIUM
CVSS 3.1
EPSS 0.07%
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.
How to fix CVE-2021-3631
To remediate CVE-2021-3631, upgrade the affected package to a fixed version below.
- Debian/libvirt—upgrade to 7.0.0-3+deb11u3 or later
Is CVE-2021-3631 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 7.0.0-3+deb11u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |