OpenStack Nova Changing vnic_type breaks compute service restart

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.

Basic information

Type
reviewed
Severity
low
Advisory on GitHub
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Repository advisory
Source code
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Published (advisory)
2022-08-04 00:00:26 UTC
Updated
2024-05-14 21:27:22 UTC
GitHub reviewed
2024-05-14 21:27:20 UTC
NVD published
2022-08-03

EPSS Score

Score Percentile
0.06% 18.47%

CVSS Scores

Base score Version Severity Vector
3.3 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

Affected packages (3)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
pip nova < 23.2.2 23.2.2
pip nova >= 24.0.0, < 24.1.2 24.1.2
pip nova >= 25.0.0, < 25.0.2 25.0.2

References

cvelogic Threat Intelligence