5.5
Medium
CVE-2026-16730 Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
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 3.1 detail
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitable with local access to the machine, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 | Versions not published | |
| Red Hat Enterprise Linux 9 | Versions not published | |
| Red Hat Hardened Images | Versions not published | |
| Red Hat OpenShift Container Platform 4 | Versions not published | |
| Red Hat Update Infrastructure 5 1788880581 | earliest → < 1788880581 | 1788880581 |
| Red Hat OpenShift Container Platform 5 | Versions not published |
References
- RHSA-2026:61340 access.redhat.com
- RHSA-2026:61355 access.redhat.com
- RHSA-2026:66018 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2506348 bugzilla.redhat.com
- github.com github.com
Timeline
- Published
- Last modified
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