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CVE-2021-3631

Published: 2 March 2022

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.

Priority

Negligible

Cvss 3 Severity Score

6.3

Score breakdown

Status

Package Release Status
libvirt
Launchpad, Ubuntu, Debian
focal
Released (6.0.0-0ubuntu8.16)
upstream
Released (7.6.0-1)
groovy Ignored
(end of life)
trusty Needs triage

xenial Needs triage

impish Not vulnerable
(7.6.0-0ubuntu1)
hirsute Ignored
(end of life)
bionic
Released (4.0.0-1ubuntu8.21)
jammy
Released (7.6.0-0ubuntu3)
kinetic
Released (7.6.0-0ubuntu3)
lunar
Released (7.6.0-0ubuntu3)
mantic
Released (7.6.0-0ubuntu3)
Patches:
upstream: https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2

Severity score breakdown

Parameter Value
Base score 6.3
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N