PT-2026-53522 · Pypi · Os-Vif

Published 2026-06-29 · Updated 2026-06-29

OSV

CVSS v3.1

9.1

Critical

Base vector

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

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.

Fix

Related Identifiers

PYSEC-2026-440

Affected Products

Os-Vif

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2019-15753 · Security Note
• https://osv.dev/vulnerability/PYSEC-2026-440 · Vendor Advisory
• https://github.com/openstack/os-vif · Note
• https://github.com/openstack/os-vif/commit/655c83d706f5de8a8cf23430782e065219297aef · Note
• https://github.com/openstack/os-vif/commit/ec9d5430300c908ea9a1c64151eee7af522a44e7 · Note
• http://openwall.com/lists/oss-security/2019/08/29/2 · Note
• https://pypi.org/project/os-vif · Note
• https://github.com/advisories/GHSA-mcpw-cp35-p3h8 · Note
• https://security.openstack.org/ossa/OSSA-2019-004.html · Note
• https://review.opendev.org/678098 · Note
• https://review.opendev.org/672834 · Note
• https://launchpad.net/bugs/1837252 · Note