synced 12 MIN AGO
01 Record

CVE-2021-3631

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

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.49% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 42.0% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-03-02 00:00Z4 YR AGO
Last updated
2024-11-19 19:33Z1 YR AGO
Reserved
2021-06-30
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-732Incorrect Permission Assignment for Critical ResourceClass
Data version
5.1
Document digest
3397fbc9bdf56d2910dc1f49ac965d5140b2cd9c9040b3f1e472f082447a8d55

05 Affected products

VendorProductVersionsPlatforms
n/alibvirtFixed-In - libvirt v7.5.0—

06 References

07 Fixed in

AlmaLinux 8

  • hivex
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • hivex-devel
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • libguestfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-bash-completion
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-benchmarking
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gfs2
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-inspect-icons
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-javadoc
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-ja
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-uk
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rescue
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rsync
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools-c
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-winsupport
    Fixed in 8.2-1.module_el8.5.0+2608+72063365
  • libguestfs-xfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libiscsi
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-utils
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libnbd
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libnbd-devel
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libvirt
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-admin
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-bash-completion
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-client
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-interface
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nodedev
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-qemu
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-secret
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-storage
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365

53 further packages in AlmaLinux 8 not shown (first 40 listed).

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • libvirt
    Not affected

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • hivex
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • hivex-devel
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • libguestfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-bash-completion
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-benchmarking
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gfs2
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-inspect-icons
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-javadoc
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-ja
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-uk
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rescue
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rsync
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools-c
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-winsupport
    Fixed in 8.2-1.module_el8.5.0+2608+72063365
  • libguestfs-xfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libiscsi
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-utils
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libnbd
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libnbd-devel
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libvirt
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-admin
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-bash-completion
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-client
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-interface
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nodedev
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-qemu
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-secret
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-storage
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365

53 further packages in CloudLinux 8 not shown (first 40 listed).

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • libvirt
    Fixed in 7.6.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • libvirt
    Fixed in 7.6.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • libvirt
    Fixed in 7.6.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • libvirt
    Fixed in 4.0.0-1ubuntu8.21

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • libvirt
    Fixed in 6.0.0-0ubuntu8.16

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • libvirt
    Fixed in 7.6.0-0ubuntu3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • libvirt
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • libvirt
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.