CVE-2022-37394 OpenStack Nova Changing vnic_type breaks compute service restart

What is CVE-2022-37394?

CVE-2022-37394 is a low-severity denial of service vulnerability in n/a, published on 3 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2022-37394?

7 open source packages ship an affected version, including nova. It affects 1 product.

Products include Openstack Nova.

How do I fix CVE-2022-37394?

Upgrade nova to a fixed version for your release line: 23.2.2, 24.1.2 or 25.0.2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-37394 being exploited?

There is no known exploitation of CVE-2022-37394 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-7214 OpenStack Nova logs sensitive context from notification exceptions Critical 9.8
• CVE-2017-17051 OpenStack Nova DoS by rebuilding the same instance with a new image multiple times High 8.6
• CVE-2020-17376 OpenStack Nova Live migration fails to update persistent domain XML High 8.3
• CVE-2017-18191 OpenStack Nova Denial of service attack on the compute host High 7.5
• CVE-2015-3280 OpenStack Compute (nova) allows remote authenticated users to cause a denial of service Medium 6.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2022-37394, GHSA-v725-c588-h936, PYSEC-2026-882, RHSA-2023:1948, UBUNTU-CVE-2022-37394.