{
  "finding_id": "DF-3403",
  "status": "not_reproduced",
  "reproduced": 0,
  "impact": "none",
  "confidence": "likely",
  "verdict": "slstart (if_sl.c:531-532) reads tp->t_slsc and dereferences sc->sc_if.if_snd to derive ifsq BEFORE lwkt_gettoken(&tp->t_token) at :539. slclose nulls tp->t_slsc (:326) and sltioctl SLIOCSUNIT swaps softc contents (:359-392) under tty_token+t_token, so an SMP race with tty close/detach yields NULL-deref (sc==NULL -> &sc->sc_if) or a softc mid-swap (garbage ifq) -> panic. Distinct site from DF-0576 (callout handlers reading sc_ttyp pre-token); this is the TX entry reading t_slsc pre-token. LEGACY bucket, root-gated setup, tiny window; Phase V skipped.",
  "exploit_chain": "",
  "evidence": [
    "findings/poc/DF-3403/README.md"
  ],
  "kernel_refs": [
    "sys/net/sl/if_sl.c:531",
    "sys/net/sl/if_sl.c:539",
    "sys/net/sl/if_sl.c:326"
  ],
  "poc_changes": "n/a (Phase V skipped for this Low finding per batch contract)",
  "attempts": 0,
  "guest_uname": "DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026\troot@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64",
  "runtime_sec": 0,
  "guest_dirty": 0,
  "build_cmd": "",
  "run_cmd": "",
  "code_hash": "",
  "notes": "",
  "recommended_fix": "Derive sc/ifsq after acquiring t_token and bail if sc == NULL"
}