CVE WatchNov 6, 2026

CVE-2026-120749

A flaw was found in D-Bus. With a privileged Monitoring client attached (for example dbus-monitor or busctl monitor), an unprivileged local

CVSS

6.2

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Nov 6, 2026 · Last modified: Nov 6, 2026 · CWE-617

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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