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Details of issue NIXPKGS-2026-2275

NIXPKGS-2026-2275
published 6 hours ago
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
Permalink CVE-2026-16730
5.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
updated 6 hours ago by @LeSuisse Activity log
  • Created suggestion 20 hours ago
  • @LeSuisse accepted 6 hours ago
  • @LeSuisse published on GitHub 6 hours ago
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

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.

References

Affected products

rhcos
dbus-broker

Matching in nixpkgs

pkgs.dbus-broker

Linux D-Bus Message Broker

  • nixos-unstable 37
    • nixpkgs-unstable 37
    • nixos-unstable-small 37
  • nixos-26.05 37
    • nixos-26.05-small 37
    • nixpkgs-26.05-darwin 37

Package maintainers