critical
CVE-2019-15753
python-os-vif: Hard-coded MAC aging time of 0 disables MAC learning in linuxbridge
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.1CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
GHSA9.1CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Red Hat5.2CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, GHSA. Rated lower by Red Hat (medium), Ubuntu (low).
Description
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.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| pip::GitHub Security Advisory pip | os-vif | 1.15.2, 1.17.0 |
| debian 11 | python-os-vif | 1.15.2-1 |
| debian 12 | python-os-vif | 1.15.2-1 |
| debian 13 | python-os-vif | 1.15.2-1 |
| debian 14 | python-os-vif | 1.15.2-1 |
| echo | python-os-vif | 1.15.2-1 |
| Red Hat | python3-os-vif | no fix listed |
| ubuntu 20.04-ESM | python-os-vif | no fix listed |
| ubuntu 22.04 | python-os-vif | no fix listed |
References
- http://www.openwall.com/lists/oss-security/2019/08/29/2
- https://access.redhat.com/security/cve/CVE-2019-15753
- https://github.com/openstack/os-vif
- https://github.com/openstack/os-vif/commit/655c83d706f5de8a8cf23430782e065219297aef
- https://github.com/openstack/os-vif/commit/ec9d5430300c908ea9a1c64151eee7af522a44e7
- https://launchpad.net/bugs/1837252
- https://nvd.nist.gov/vuln/detail/CVE-2019-15753
- https://review.opendev.org/672834