CVE-2026-16730
Full vulnerability record from the local CVENow database.
Description
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-07-24 12:16:47.717000
Last modified
2026-11-05 20:17:51.180000
View original CVE JSON
{
"id": "CVE-2026-16730",
"sourceIdentifier": "[email protected]",
"published": "2026-07-24T12:16:47.717",
"lastModified": "2026-11-05T20:17:51.180",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "dbus-broker",
"cpes": [
"cpe:/o:redhat:enterprise_linux:10.2"
],
"versions": [
{
"version": "0:36-5.el10_2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "dbus-broker",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::baseos"
],
"versions": [
{
"version": "0:28-9.el9_8",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
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"product": "Red Hat Update Infrastructure 5",
"defaultStatus": "affected",
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"packageName": "rhui5/cds-kubernetes-rhel9",
"cpes": [
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],
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{
"version": "1788880445",
"lessThan": "*",
"versionType": "rpm",
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}
]
},
{
"vendor": "Red Hat",
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"packageName": "rhui5/cds-rhel9",
"cpes": [
"cpe:/a:redhat:rhui:5::el9"
],
"versions": [
{
"version": "1788880464",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Update Infrastructure 5",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhui5/haproxy-rhel9",
"cpes": [
"cpe:/a:redhat:rhui:5::el9"
],
"versions": [
{
"version": "1788880456",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Update Infrastructure 5",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhui5/installer-rhel9",
"cpes": [
"cpe:/a:redhat:rhui:5::el9"
],
"versions": [
{
"version": "1788765051",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Update Infrastructure 5",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhui5/rhua-rhel9",
"cpes": [
"cpe:/a:redhat:rhui:5::el9"
],
"versions": [
{
"version": "1788880581",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Hardened Images",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "dbus-broker",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift/ose-rhel-coreos-9",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 5",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift/ose-rhel-coreos-9",
"cpes": [
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]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-07-24T14:47:59.239150Z",
"id": "CVE-2026-16730",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-755"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:61340",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:61355",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:66018",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-16730",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506348",
"source": "[email protected]"
},
{
"url": "https://github.com/bus1/dbus-broker/issues/435",
"source": "[email protected]"
}
]
}