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Published: 6 October 2020

A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.


Read-only clients can't exploit this flaw.
Clients connecting to the read-write socket can exploit this to
crash libvirt or possibly execute code, but on Ubuntu,
access to the read-write socket already grants root-equivalent
permissions, so this flaw has limited impact. Setting priority
to negligible.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
impish Not vulnerable
hirsute Not vulnerable
groovy Ignored
(end of life)
trusty Needed

Released (6.8.0-1)
xenial Needed

jammy Not vulnerable
lunar Not vulnerable
Released (4.0.0-1ubuntu8.21)
Released (6.0.0-0ubuntu8.16)
kinetic Not vulnerable
mantic Not vulnerable
upstream: (v6.8.0)
upstream: (v6.8.0)
upstream: (v6.8.0)
upstream: (v6.8.0)

Severity score breakdown

Parameter Value
Base score 6.7
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H