Medium
dbus-broker — security advisory
A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.
- Products
- dbus-broker
- Affected versions
- 29-1, 29-3, 29-4, 29-4build1, 33-1ubuntu1, 35-2, 35-2ubuntu0.1, 37-2, 37-3, 37-4, 37-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-16730
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 19:34 UTC · Revision 1
Source evidence
A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.
osv:UBUNTU-CVE-2026-16730
dbus-broker
Fixed versions: Not specified
dbus-broker
Fixed versions: Not specified
dbus-broker
Fixed versions: Not specified
Complete source record
{
"id": "eef0f0987a8af9cc3564c9352d9a4db9619ea79d441623bb119b35296ae937b9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-16730",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-16730",
"summary": "A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.",
"evidence": "osv:UBUNTU-CVE-2026-16730",
"products": [
{
"name": {
"value": "dbus-broker",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "29-1",
"evidence": "/affected/0/versions"
},
{
"value": "29-3",
"evidence": "/affected/0/versions"
},
{
"value": "29-4",
"evidence": "/affected/0/versions"
},
{
"value": "29-4build1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "dbus-broker",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "33-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "35-2",
"evidence": "/affected/1/versions"
},
{
"value": "35-2ubuntu0.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "dbus-broker",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "37-2",
"evidence": "/affected/2/versions"
},
{
"value": "37-3",
"evidence": "/affected/2/versions"
},
{
"value": "37-4",
"evidence": "/affected/2/versions"
},
{
"value": "37-5",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-16730",
"aliases": [
"UBUNTU-CVE-2026-16730"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dbus-broker",
"purl": "pkg:deb/ubuntu/dbus-broker?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"29-1",
"29-3",
"29-4",
"29-4build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dbus-broker",
"binary_version": "29-4build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dbus-broker",
"purl": "pkg:deb/ubuntu/dbus-broker?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"33-1ubuntu1",
"35-2",
"35-2ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dbus-broker",
"binary_version": "35-2ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dbus-broker",
"purl": "pkg:deb/ubuntu/dbus-broker?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"37-2",
"37-3",
"37-4",
"37-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dbus-broker",
"binary_version": "37-5"
}
]
}
}
],
"modified": "2026-10-22T23:20:04.048742097Z",
"provider": "osv",
"upstream": [
"CVE-2026-16730"
],
"references": [
"https://ubuntu.com/security/CVE-2026-16730",
"https://www.cve.org/CVERecord?id=CVE-2026-16730",
"https://access.redhat.com/security/cve/CVE-2026-16730"
]
},
"related_cves": [
{
"value": "CVE-2026-16730",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 410118,
"published_at": "2026-07-24T12:16:00+00:00"
}