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Fencer Vulns
low 3.3

CVE-2022-37394 json

OpenStack Nova Changing vnic_type breaks compute service restart

published 2022-08-03 4 y ago modified 2026-07-07 4 mo ago also GHSA-v725-c588-h936 , PYSEC-2026-882 , EUVD-2022-6627

cvss
3.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

An issue was discovered in OpenStack Nova before 23.2.2, 24.x before 24.1.2, and 25.x before 25.0.2. By creating a neutron port with the direct vnic_type, creating an instance bound to that port, and then changing the vnic_type of the bound port to macvtap, an authenticated user may cause the compute service to fail to restart, resulting in a possible denial of service. Only Nova deployments configured with SR-IOV are affected.

Patch / fix

  • pypi nova 23.2.2, 24.1.2, 25.0.2
  • openstack nova 23.2.2, 24.1.2, 25.0.2
  • nova Debian 14, Debian 13, Debian 12 2:26.0.0~rc1-3

debian advisories DEBIAN-CVE-2022-37394

  • nova Ubuntu 20.04 LTS 2:21.2.4-0ubuntu2.2
  • nova Ubuntu 22.04 LTS 3:25.1.0-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-37394

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openstack-nova openstack 16.2 1:20.6.2-2.20230308185148.fc01371.el8ost

red hat advisories RHSA-2023:1948

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-37394 updated cvss 3.3

openstack-nova: Compute service fails to restart if the vnic_type of a bound port changed from direct to macvtap

  • Red Hat OpenStack Platform 13 (Queens) python-nova, openstack-nova, python-nova-tests, openstack-nova-api, openstack-nova-cells, openstack-nova-common, +10 more
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 16.1 python3-nova, openstack-nova, openstack-nova-api, openstack-nova-common, openstack-nova-compute, openstack-nova-console, +6 more
    affected: no fix available “Fix deferred”
  • Red Hat OpenStack Platform 17.0 python3-nova, openstack-nova, openstack-nova-api, openstack-nova-common, openstack-nova-compute, openstack-nova-conductor, +5 more
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 16.2 openstack-nova 20.6.2-2.20230308185148.fc01371.el8ost
    fixed: vendor fix RHSA-2023:1948
  • Red Hat OpenStack Platform 16.2 python3-nova 20.6.2-2.20230308185148.fc01371.el8ost, openstack-nova-api 20.6.2-2.20230308185148.fc01371.el8ost, openstack-nova-common 20.6.2-2.20230308185148.fc01371.el8ost, openstack-nova-compute 20.6.2-2.20230308185148.fc01371.el8ost, openstack-nova-console 20.6.2-2.20230308185148.fc01371.el8ost, openstack-nova-conductor 20.6.2-2.20230308185148.fc01371.el8ost, +5 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/ossa/+bug/1981813 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
pypi nova
<23.2.2
>=24.0.0, <24.1.2
>=25.0.0, <25.0.2
23.2.2
24.1.2
25.0.2

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.