CVE-2026-16730
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- dbus-broker
Version range not reported
- dbus-broker
Version range not reported
- rhui5/cds-kubernetes-rhel9
Version range not reported
- rhui5/cds-rhel9
Version range not reported
- rhui5/haproxy-rhel9
Version range not reported
- rhui5/installer-rhel9
Version range not reported
- rhui5/rhua-rhel9
Version range not reported
- dbus-broker
Version range not reported
- openshift/ose-rhel-coreos-9
Version range not reported