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CVE-2021-3631

MEDIUM
6.3
CVSS Score
Published: March 2, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:05 AM UTC
4 products affected across 2 vendorsEnterprise LinuxOpenShift Container PlatformONTAP Select Deploy administration utility

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ONTAP Select Deploy administration utility· NetApp
95%
All versions
Enterprise Linux· Red Hatrpm
95%
8.0
Libvirt· Red Hat
95%
v < 7.5.0Fixed-In - libvirt v7.5.0
Affected range stops below 7.5.0, so it looks safe — our inference, not a vendor statement
OpenShift Container Platform· Red Hatcontainer
95%
4.8

References (7)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-732

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