A flaw was found in dbus-broker. (CVE-2026-16730)
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.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16730 is a denial of service vulnerability in dbus-broker where EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit when the process file-descriptor limit is reached. This flaw allows a local attacker to trigger a denial of service on the desktop session by opening many connections to the user session bus. The vulnerability affects Linux systems using dbus-broker, including Red Hat Enterprise Linux versions 9 and 10. Red Hat has issued security advisories and patches to fix this issue.
Potential Impact
The vulnerability results in a denial of service condition on the desktop session bus, disrupting normal operation of the user session. There is no confidentiality or integrity impact reported. The attack requires local access with low privileges and does not require user interaction. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Red Hat has released official security updates for dbus-broker in Red Hat Enterprise Linux 9 and 10 that fix this vulnerability. Users should apply these updates promptly. For detailed update instructions, refer to Red Hat's advisory and article at https://access.redhat.com/articles/11258. No additional mitigation actions are required beyond applying the vendor-provided patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:61355
- Cve Count
- 1
- State
- PUBLISHED
Threat ID: 6a95a0dcacd9273b4947dea0
Added to database: 08/31/2026, 15:42:20 UTC
Last enriched: 09/09/2026, 11:53:41 UTC
Last updated: 10/16/2026, 06:48:15 UTC
Views: 52
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