{"id":"CVE-2026-16730","title":"A flaw was found in dbus-broker","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 ma…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-755"],"vendor":"Red Hat","product":"dbus-broker","affected":["dbus-broker (all versions)","dbus-broker (all versions)","rhui5/cds-kubernetes-rhel9 (all versions)","rhui5/cds-rhel9 (all versions)","rhui5/haproxy-rhel9 (all versions)","rhui5/installer-rhel9 (all versions)","rhui5/rhua-rhel9 (all versions)","dbus-broker (all versions)","openshift/ose-rhel-coreos-9 (all versions)"],"published":"2026-07-24","updated":"2026-09-10","sourceUpdated":"2026-09-10T18:17:56.807","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-16730","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:61340","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:61355","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:66018","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-16730","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506348","label":"secalert@redhat.com"},{"url":"https://github.com/bus1/dbus-broker/issues/435","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16730.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-16730"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16730"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-24T14:47:59.239150Z"},"epss":0.00109,"epssPercentile":0.01384,"ingestedAt":"2026-08-22T13:32:35.674Z","patched":["enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","update_infrastructure 5"],"slug":"CVE-2026-16730","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:61340** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61340)\n- **RHSA-2026:61355** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61355)\n- **RHSA-2026:66018** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:66018)\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4, Red Hat Hardened Images · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16730.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}