Bug 2567978 (CVE-2026-120749) - 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
Summary: CVE-2026-120749 dbus: dbus-daemon: dbus-daemon aborts (reply_serial != 0) whe...
Keywords:
Status: NEW
Alias: CVE-2026-120749
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-05 22:55 UTC by OSIDB Bzimport
Modified: 2026-11-05 23:34 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-11-05 22:55:24 UTC 
A flaw was found in dbus. This is an incomplete fix for CVE-2023-34969. On multi-user buses such as dbus-daemon --system, if a privileged user has attached a monitoring process such as dbus-monitor or busctl monitor to the system bus, an unprivileged user can trigger a dbus-daemon crash, resulting in a denial of service.

Upstream reference:
https://gitlab.freedesktop.org/dbus/dbus/-/work_items/576

Reported via PSIRTSUPT-26737 by Simon McVittie.
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