CVE-2026-16730

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.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:36-5.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 90:28-9.el9_8 < *unaffected

Weaknesses

  • CWE-755: Improper Handling of Exceptional Conditions

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References