ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-16730

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

Published Jul 24, 2026 · catalog updated Sep 10, 2026 · Red Hat Red Hat Enterprise Linux 10

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-16730. EPSS is 0.15%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Advisory link
Affected products
vendor Red Hat Red Hat Enterprise Linux 10 · vendor Red Hat Red Hat Enterprise Linux 9 · vendor Red Hat Red Hat Hardened Images · vendor Red Hat Red Hat Update Infrastructure 5

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Red Hat Red Hat Enterprise Linux 10version unspecified
  • vendor Red Hat Red Hat Enterprise Linux 9version unspecified
  • vendor Red Hat Red Hat Hardened Imagesversion unspecified
  • vendor Red Hat Red Hat Update Infrastructure 5version unspecified

How to fix CVE-2026-16730

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the bsi record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-16730. EPSS is 0.15%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 10 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-755: Improper Handling of Exceptional Conditions. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 10, 2026 · CVE.org

    Updated

    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 db

  2. Oct 30, 2026 · BSI CERT-Bund

    Detected

    CVE-2026-16730 is listed by Red Hat Enterprise Linux (pipewire,dbus-broker): Mehrere Schwachstellen ermöglichen Denial of Service.

Sources

  • BSI CERT-BundGovernment advisoryCVE-2026-16730

    Red Hat Enterprise Linux (pipewire,dbus-broker): Mehrere Schwachstellen ermöglichen Denial of Service

    wid.cert-bund.de
  • CVE.orgVulnerability recordCVE-2026-16730

    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

    cve.org

References

Freshness

Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 31, 2026
  • BSI CERT-BundOct 31, 2026