UBUNTU-CVE-2026-16730

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Source
https://ubuntu.com/security/CVE-2026-16730
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-16730
Upstream
  • CVE-2026-16730
Published
2026-07-24T12:16:00Z
Modified
2026-07-29T07:53:23Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:22.04:LTS / dbus-broker

Package

Name
dbus-broker
Purl
pkg:deb/ubuntu/dbus-broker?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

Other
29-1
29-3
29-4
29-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dbus-broker",
            "binary_version": "29-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"

Ubuntu:24.04:LTS / dbus-broker

Package

Name
dbus-broker
Purl
pkg:deb/ubuntu/dbus-broker?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

Other
33-1ubuntu1
35-2
35-2ubuntu0.*
35-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dbus-broker",
            "binary_version": "35-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"

Ubuntu:26.04:LTS / dbus-broker

Package

Name
dbus-broker
Purl
pkg:deb/ubuntu/dbus-broker?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

Other
37-2
37-3
37-4
37-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dbus-broker",
            "binary_version": "37-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-16730.json"