This proof of concept enables an unprivileged local attacker to make the system unusable for all users, by making the system D-Bus unresponsive. The vulnerability is a file descriptor leak in D-Bus. The original bug report is available at gitlab.freedesktop.org.
To run the PoC:
make
./fd_dos /var/run/dbus/system_bus_socketBe aware that you may need to reboot your system after running the PoC.