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CVE-2019-15753 — Vulnerability in os-vif — CVE Details

CRITICAL

OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning

Published June 29, 2026Updated July 2, 2026Source: osv

Summary

In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC aging time of 0 disables MAC learning in linuxbridge, forcing obligatory Ethernet flooding of non-local destinations, which both impedes network performance and allows users to possibly view the content of packets for instances belonging to other tenants sharing the same network. Only deployments using the linuxbridge backend are affected. This occurs in PyRoute2.add() in `internal/command/ip/linux/impl_pyroute2.py`.

Advisory Timeline

  • First published June 29, 2026 (105 days ago).
  • Last revised July 2, 2026 — 3 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update os-vif to 1.15.2 or later
pip install "os-vif>=1.15.2"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
os-vif
pypi
1.15.0, 1.15.1, 1.16.01.15.2, 1.17.0

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Frequently Asked Questions

What is CVE-2019-15753?
OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2019-15753?
CVE-2019-15753 affects os-vif. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2019-15753 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

PYSEC-2026-440
GHSA-mcpw-cp35-p3h8

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