Bug 2506348 (CVE-2026-16730) - CVE-2026-16730 dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup
Summary: CVE-2026-16730 dbus-broker: dbus-broker: session bus denial of service via EM...
Keywords:
Status: NEW
Alias: CVE-2026-16730
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2506704 2506705
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-23 05:56 UTC by OSIDB Bzimport
Modified: 2026-09-10 17:43 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:66479 0 None None None 2026-09-10 17:43:08 UTC
Red Hat Product Errata RHSA-2026:61340 0 None None None 2026-08-31 10:01:48 UTC
Red Hat Product Errata RHSA-2026:61355 0 None None None 2026-08-31 10:25:17 UTC

Description OSIDB Bzimport 2026-07-23 05:56:13 UTC 
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 3 errata-xmlrpc 2026-08-31 10:01:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:61340 https://access.redhat.com/errata/RHSA-2026:61340
Comment 4 errata-xmlrpc 2026-08-31 10:25:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:61355 https://access.redhat.com/errata/RHSA-2026:61355
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