Incorrect permission assignment in libvirt
Priority LOW 31CWE-732Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 5 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00493 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 3 advisoriesRed Hat: 5 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | libvirt | Fixed-In - libvirt v7.5.0 | — | No fix listed | CNA |
- libvirt Vendor— Affected Fixed-In - libvirt v7.5.0 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:redhat:libvirt:*:*:*:*:*:*:*:* | before 7.5.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:openshift_container_platform:4.8:*:*:*:*:*:*:* | 4.8 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
- cpe:2.3:a:redhat:libvirt:*:*:*:*:*:*:*:* Versions before 7.5.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:openshift_container_platform:4.8:*:*:*:*:*:*:* Versions 4.8 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
Remediation
Red Hat 3 advisories
- RHSA-2021:4191 Released 2021-11-09 · Red Hat rating Moderatevirt:rhel and virt-devel:rhel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt-devel:rhel, hivex-1.3.18-21.module+el8.5.0+10709+b3edb581.i686::virt-devel:rhel, hivex-devel-1.3.18-21.module+el8.5.0+10709+b3edb581.i686::virt-devel:rhel +47
- Red Hat Enterprise Linux AppStream (v. 8) SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.noarch::virt:rhel, SLOF-20191022-3.git899d9883.module+el8.3.0+6423+e4cb6418.src::virt:rhel, hivex-1.3.18-21.module+el8.5.0+10709+b3edb581.aarch64::virt:rhel +47
- RHSA-2021:3704 Released 2021-09-30 · Red Hat rating Moderatevirt:8.2 and virt-devel:8.2 security update
- Advanced Virtualization CodeReady Builder for RHEL 8.2.1 SLOF-20191022-3.git899d9883.module+el8.2.0+5449+efc036dd.src::virt-devel:8.2, hivex-1.3.18-20.module+el8.2.0+5588+63a201c3.i686::virt-devel:8.2, hivex-devel-1.3.18-20.module+el8.2.0+5588+63a201c3.i686::virt-devel:8.2 +47
- Advanced Virtualization for RHEL 8.2.1 SLOF-20191022-3.git899d9883.module+el8.2.0+5449+efc036dd.noarch::virt:8.2, SLOF-20191022-3.git899d9883.module+el8.2.0+5449+efc036dd.src::virt:8.2, hivex-1.3.18-20.module+el8.2.0+5588+63a201c3.aarch64::virt:8.2 +47
- RHSA-2021:3703 Released 2021-09-30 · Red Hat rating Moderatevirt:av and virt-devel:av security and bug fix update
- Advanced Virtualization for RHEL 8.4.0.Z SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.noarch::virt:av, SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.src::virt-devel:av, SLOF-20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9.src::virt:av +47
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 Advanced Virtualization | Affected | No fix yet |
| Advanced Virtualization CodeReady Builder for RHEL 8.2.1 | Fixed | RHSA-2021:3704 |
| Advanced Virtualization for RHEL 8.2.1 | Fixed | RHSA-2021:3704 |
| Advanced Virtualization for RHEL 8.4.0.Z | Fixed | RHSA-2021:3703 |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2021:4191 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2021:4191 |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3631
- 2026-10-03 Alias added: GHSA-4225-xq9f-4ww3
References
Advisory 4
Sources
- CVE-2021-3631 · CVE Program
- CVE-2021-3631 · NVD
- FIRST EPSS
- GHSA-4225-xq9f-4ww3 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-3631 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences