Baseline kernel (vulnerable, stock):
  DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026
      root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
  hw.ncpu = 6

Fixed kernel (fix.diff applied to /usr/src/sys/net/rtsock.c,
make -j6 nativekernel + make installkernel + reboot):
  DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Fri Sep 11 09:08:32 UTC 2026
      root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

malloc type observed: "routetbl" (M_RTABLE), type limit 390M on this guest.