Description
A flaw was found in D-Bus. With a privileged Monitoring client attached (for example dbus-monitor or busctl monitor), an unprivileged local user can cause dbus-daemon to abort if a driver-originated broadcast such as NameOwnerChanged or ActivatableServicesChanged cannot be delivered to a recipient (for example due to a deny rule or an exceeded outgoing message queue). Driver broadcasts still use serial 0; when delivery fails, composing the monitor error reply asserts reply_serial != 0 and aborts the daemon. This is an incomplete fix for CVE-2023-34969, which only assigned serials for driver messages sent to a single recipient. On the well-known system bus this is a denial of service.
Published: 2026-11-06
Score: 6.2 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

Vendor Workaround

This can only be done if a monitoring process such as dbus-monitor or busctl monitor is active on the same dbus-daemon instance, which is a privileged operation that can only be done by root or the Unix uid of the message bus. If no monitoring process is active, then the vulnerable code is not reached.

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History

Fri, 06 Nov 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Red Hat
Red Hat enterprise Linux
Redhat hardened Images
Vendors & Products Red Hat
Red Hat enterprise Linux
Redhat hardened Images

Fri, 06 Nov 2026 07:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in D-Bus. With a privileged Monitoring client attached (for example dbus-monitor or busctl monitor), an unprivileged local user can cause dbus-daemon to abort if a driver-originated broadcast such as NameOwnerChanged or ActivatableServicesChanged cannot be delivered to a recipient (for example due to a deny rule or an exceeded outgoing message queue). Driver broadcasts still use serial 0; when delivery fails, composing the monitor error reply asserts reply_serial != 0 and aborts the daemon. This is an incomplete fix for CVE-2023-34969, which only assigned serials for driver messages sent to a single recipient. On the well-known system bus this is a denial of service.
Title Dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver cannot be delivered to a monitored bus
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
Weaknesses CWE-617
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Red Hat Enterprise Linux
Redhat Enterprise Linux Hardened Images Hummingbird Rhel Els
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-06T06:56:57.944Z

Reserved: 2026-11-02T21:01:14.154Z

Link: CVE-2026-120749

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-06T07:17:06.153

Modified: 2026-11-06T07:17:10.743

Link: CVE-2026-120749

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T13:15:03Z

Weaknesses