CVE-2026-16730
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
MEDIUM 5.5
At a glance
- Source
- NVD
- EPSS
- EPSS 0.15 % · percentile 5 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
Description
A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.
Weaknesses (CWE)
- CWE-755 — Improper Handling of Exceptional Conditions
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | redhat |
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-48559
- GCVE · GCVE-0-2026-16730
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat Enterprise Linux 10 | unaffected 0:36-5.el10_2 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:28-9.el9_8 < * |
| Red Hat · Red Hat Update Infrastructure 5 | unaffected 1788880445 < * |
| Red Hat · Red Hat Update Infrastructure 5 | unaffected 1788880464 < * |
| Red Hat · Red Hat Update Infrastructure 5 | unaffected 1788880456 < * |
| Red Hat · Red Hat Update Infrastructure 5 | unaffected 1788765051 < * |
| Red Hat · Red Hat Update Infrastructure 5 | unaffected 1788880581 < * |
| Red Hat · Red Hat Hardened Images | |
| Red Hat · Red Hat OpenShift Container Platform 4 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |