Medium [CVE-2026-16730] session bus denial of service via EMFILE during peer setup
This medium-severity Red Hat Linux advisory covers CVE-2026-16730 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Update Infrastructure 5.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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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.
Exploitation requires local access or a compromised application in the same user session. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-755. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Update Infrastructure 5; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4.
Red Hat fixing advisory: RHSA-2026:61340, RHSA-2026:61355, RHSA-2026:66018.
Affected products named by the advisory: Red Hat package: dbus-broker.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- dbus-broker-0:36-5.el10_2
- dbus-broker-0:28-9.el9_8
- rhui5/cds-kubernetes-rhel9:1788880445
- rhui5/cds-rhel9:1788880464
- rhui5/haproxy-rhel9:1788880456
- rhui5/installer-rhel9:1788765051
- rhui5/rhua-rhel9:1788880581
- RHSA-2026:61340
- RHSA-2026:61355
- RHSA-2026:66018
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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