CVE-2021-3631

low-risk
Published 2022-03-02

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.

Do I need to act?

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0.07% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.3/10 Medium
LOCAL / HIGH complexity

Affected Products (4)

Affected Vendors

Redhat Netapp

References (14)

Vendor Advisory https://access.redhat.com/errata/RHSA-2021:3631
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1977726
Patch https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620...
Exploit https://gitlab.com/libvirt/libvirt/-/issues/153
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
Third Party Advisory https://security.gentoo.org/glsa/202210-06
Third Party Advisory https://security.netapp.com/advisory/ntap-20220331-0010/
Vendor Advisory https://access.redhat.com/errata/RHSA-2021:3631
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1977726
Patch https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620...
Exploit https://gitlab.com/libvirt/libvirt/-/issues/153
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
Third Party Advisory https://security.gentoo.org/glsa/202210-06
Third Party Advisory https://security.netapp.com/advisory/ntap-20220331-0010/
26
/ 100
low-risk
Severity 16/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 10/34 · Low