Home/CVE/A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one
CVE

CVE-2021-3631

A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one

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.

MEDIUM · CVSS 6.3 EPSS 0.00067
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-732Incorrect Permission Assignment for Critical Resource
CWE-732Incorrect Permission Assignment for Critical Resource
▤

Affected Products & Versions

4
redhat libvirt< 7.5.0
redhat openshift container platformall versions
redhat enterprise linuxall versions
netapp ontap select deploy administration utilityall versions
⚠

Public Exploits & PoCs

1
pocgitlab.com · issues/153gitlab.com
▣

Scoring & Timeline

6.3
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Mar 2022 · 11:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

10
suse-csafopenSUSE-SU-2024:11008-1
usnUSN-5399-1
msrcCVE-2021-3631
rhsaRHSA-2021:3704Moderate
rhsaRHSA-2021:3703Moderate
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://access.redhat.com/errata/RHSA-2021:3631Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1977726Issue TrackingVendor Advisory
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.gentoo.org/glsa/202210-06Third Party Advisory
https://security.netapp.com/advisory/ntap-20220331-0010/Third Party Advisory
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