A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00101.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00105.html
https://access.redhat.com/errata/RHSA-2019:2294
https://bugzilla.redhat.com/show_bug.cgi?id=1663051
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3840
https://www.redhat.com/archives/libvir-list/2019-January/msg00241.html
Source: MITRE
Published: 2019-03-27
Updated: 2019-05-05
Type: CWE-476
Base Score: 3.5
Vector: AV:N/AC:M/Au:S/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 6.8
Severity: LOW
Base Score: 6.3
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Impact Score: 4
Exploitability Score: 1.8
Severity: MEDIUM