CVE-2026-120749

Dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) when a broadcast from the driver cannot be delivered to a monitored bus

CVSS score

6.2

EPSS probability

—

Risk score

0.6

Published

1 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-120749: D-Bus dbus-daemon Denial of Service Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

A flaw exists in D-Bus that allows a local user to cause a denial of service when a privileged monitoring client is attached. This vulnerability stems from an incomplete fix for CVE-2023-34969.

Why does it matter?

This denial of service condition, which can be triggered by local users when a privileged monitoring client is active, threatens system reliability and availability.

What should be done?

Follow vendor advisories
Check for available updates and patch status

Chain of evidence and sources2 verified claims

CVE-2026-120749 açığı, D-Bus dbus-daemon sürecinin sonlandırılmasına neden olan bir servis dışı bırakma kusurudur.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Bu açık, CVE-2023-34969 için yapılan eksik bir düzeltme sonucunda ortaya çıkmıştır.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-617

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-120749 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Red Hat	Red Hat Enterprise Linux 10	View
2	Red Hat	Red Hat Enterprise Linux 6	View
3	Red Hat	Red Hat Enterprise Linux 7	View
4	Red Hat	Red Hat Enterprise Linux 8	View
5	Red Hat	Red Hat Enterprise Linux 9	View
6	Red Hat	Red Hat Hardened Images	View

Total affected vendors: 1|Products: 6

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.2	CVSS V3_1	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CVE CNA
6.2	CVSS V31	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-120749 is associated with the following CWEs:

CWE-617: Common Weakness Enumeration Entry CWE-617

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-120749 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://access.redhat.com/security/cve/CVE-2026-120749vendor-advisory RHBZ#2567978vendor-advisory https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/565vendor-advisory https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/592vendor-advisory https://gitlab.freedesktop.org/dbus/dbus/-/work_items/576vendor-advisory

CVSS Vector Radar Chart

6.2 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

Red Hat

Weakness Type (CWE & CAPEC)

CWE-617

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