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OpenStack Nova Changing vnic_type breaks compute service restart

Low severity GitHub Reviewed Published Aug 4, 2022 to the GitHub Advisory Database • Updated May 14, 2024

Package

pip nova (pip)

Affected versions

< 23.2.2
>= 24.0.0, < 24.1.2
>= 25.0.0, < 25.0.2

Patched versions

23.2.2
24.1.2
25.0.2

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.

References

Published by the National Vulnerability Database Aug 3, 2022
Published to the GitHub Advisory Database Aug 4, 2022
Reviewed May 14, 2024
Last updated May 14, 2024

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS score

0.047%
(18th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2022-37394

GHSA ID

GHSA-v725-c588-h936

Source code

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