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TI-2026-13932 Aliases CVE-2026-16730GHSA-77qf-9j4m-ph58

Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

Priority LOW 24CWE-755Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 3 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00154 4th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 3 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—36-5.el10_2Patch availableCNA
Red HatRed Hat Enterprise Linux 9—28-9.el9_8Patch availableCNA
Red HatRed Hat Update Infrastructure 5—1788880445Patch availableCNA
Red HatRed Hat Update Infrastructure 5—1788880464Patch availableCNA
Red HatRed Hat Update Infrastructure 5—1788880456Patch availableCNA
Red HatRed Hat Update Infrastructure 5—1788765051Patch availableCNA
Red HatRed Hat Update Infrastructure 5—1788880581Patch availableCNA
Red HatRed Hat Hardened Images——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 5——No fix listedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 36-5.el10_2 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 28-9.el9_8 Patch available CNA
  • Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1788880445 Patch available CNA
  • Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1788880464 Patch available CNA
  • Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1788880456 Patch available CNA
  • Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1788765051 Patch available CNA
  • Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1788880581 Patch available CNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 6

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.210.2—Red Hat
cpe:/o:redhat:enterprise_linux:9::baseos9—Red Hat
cpe:/a:redhat:rhui:5::el95—Red Hat
cpe:/a:redhat:hummingbird:11—Red Hat
cpe:/a:redhat:openshift:44—Red Hat
cpe:/a:redhat:openshift:55—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:9::baseos Versions 9 — ·Red Hat
  • cpe:/a:redhat:rhui:5::el9 Versions 5 — ·Red Hat
  • cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat
  • cpe:/a:redhat:openshift:4 Versions 4 — ·Red Hat
  • cpe:/a:redhat:openshift:5 Versions 5 — ·Red Hat

Remediation

Red Hat 3 advisories

  • RHSA-2026:66018 Released 2026-09-09 · Red Hat rating Important
    Red Hat Update Infrastructure 5.3 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:61355 Released 2026-08-31 · Red Hat rating Moderate
    dbus-broker security update
    • Red Hat Enterprise Linux BaseOS (v. 9) dbus-broker-28-9.el9_8
  • RHSA-2026:61340 Released 2026-08-31 · Red Hat rating Moderate
    dbus-broker security update
    • Red Hat Enterprise Linux BaseOS (v. 10) dbus-broker-36-5.el10_2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesAffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:61340
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:61355
Red Hat Update Infrastructure 5Fixed RHSA-2026:66018

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16730
  2. 2026-10-03 Alias added: GHSA-77qf-9j4m-ph58
  3. 2026-11-05 Affected versions changed · CNA
  4. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 3

Other 3

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences