{
 "finding_id": "DF-3410",
 "status": "reproduced",
 "reproduced": 1,
 "poc_path": "findings/poc/DF-3410",
 "artifact_dir": "findings/poc/DF-3410",
 "build_cmd": "cc -O -o <prog> <prog>.c   (on the guest)",
 "run_cmd": "(no arg; root)",
 "code_hash": "a5a1f2270fa06b1fefa85f91098419f0d6a34e9ddea793ba4181755d620820fd",
 "build_log": "(inline)",
 "run_log": "live1.log",
 "impact": "none",
 "confidence": "certain",
 "verdict": "TUNSIFMODE validates *(int*)data & ~IFF_MULTICAST but ORs the RAW word into if_flags: the IFF_MULTICAST bit rides along outside the validated mode set (demonstrated live: raw word IFF_BROADCAST|IFF_MULTICAST accepted and MULTICAST kept set). Honest impact ceiling: the mask admits only the MULTICAST bit as extra, and tun(4) is created with IFF_MULTICAST already set (and it is in IFF_CANTCHANGE), so no stock configuration delta exists.",
 "exploit_chain": "",
 "evidence": "live1.log DF-3410 section: flags before 0x8010 [PTP MCAST], after TUNSIFMODE(BCAST) 0x8002 [BCAST MCAST], raw word accepted, BCAST|0x100 correctly EINVALs",
 "kernel_refs": [
  "sys/net/tun/if_tun.c:731-738",
  "sys/net/if.h:119-124"
 ],
 "poc_changes": "",
 "attempts": 3,
 "guest_uname": "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",
 "runtime_sec": 60,
 "guest_dirty": 0,
 "runner": "df-bsd-reviewer",
 "notes": "",
 "recommended_fix": "fix.diff",
 "fix_status": "not_testable",
 "fix_verdict": "One-line fix (OR the masked value) is in fix.diff; kernel not rebuilt for this no-delta Low item.",
 "fix_baseline_reproduced": null,
 "fix_patched_reproduced": null
}