PYSEC-2026-440
Vulnerability from pysec - Published: 2026-06-29 11:50 - Updated: 2026-07-02 12:46In 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.
| Name | purl | os-vif | pkg:pypi/os-vif |
|---|
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "os-vif",
"purl": "pkg:pypi/os-vif"
},
"ranges": [
{
"events": [
{
"introduced": "1.15.0"
},
{
"fixed": "1.15.2"
},
{
"introduced": "1.16.0"
},
{
"fixed": "1.17.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.16.0",
"1.15.0",
"1.15.1"
]
}
],
"aliases": [
"CVE-2019-15753",
"GHSA-mcpw-cp35-p3h8"
],
"details": "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`.",
"id": "PYSEC-2026-440",
"modified": "2026-07-02T12:46:41.101315Z",
"published": "2026-06-29T11:50:32.870631Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15753"
},
{
"type": "WEB",
"url": "https://github.com/openstack/os-vif/commit/655c83d706f5de8a8cf23430782e065219297aef"
},
{
"type": "WEB",
"url": "https://github.com/openstack/os-vif/commit/ec9d5430300c908ea9a1c64151eee7af522a44e7"
},
{
"type": "PACKAGE",
"url": "https://github.com/openstack/os-vif"
},
{
"type": "WEB",
"url": "https://launchpad.net/bugs/1837252"
},
{
"type": "WEB",
"url": "https://review.opendev.org/672834"
},
{
"type": "WEB",
"url": "https://review.opendev.org/678098"
},
{
"type": "WEB",
"url": "https://security.openstack.org/ossa/OSSA-2019-004.html"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2019/08/29/2"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/os-vif"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-mcpw-cp35-p3h8"
}
],
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Sightings and recorded dates, grouped by day · UTC
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