Bug 2506705

Summary: CVE-2026-16730 dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: dbus-brokerAssignee: David Rheinsberg <david>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 45CC: david, lnykryn, yaneti
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["0c912a6c-6a26-4eb9-8988-b4454bc2cb80"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2506348    

Description Ganesh 2026-07-24 11:19:52 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in dbus-broker. When the broker's file-descriptor table is exhausted, getsockopt(SO_PEERPIDFD) (and similarly accept-path failures) can return EMFILE/ENFILE. dbus-broker treats these as fatal errors and exits instead of refusing the new connection. A local user or Flatpak application in the same user session can open many dangling session-bus connections to trigger this condition, crashing the session bus and disrupting the desktop session.
Comment 1 Aoife Moloney 2026-08-17 15:36:23 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.