{
  "finding_id": "DF-3670",
  "status": "inconclusive",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "Source-level certain (upstream divergence proven by diff): ixgbe_calc_eeprom_checksum_generic (ixgbe_common.c:2211-2262) walks NVM sections using NVM-resident pointer (2233) and length (2242) with a u16 loop index (2214, loop at 2250) and no bound against hw->eeprom.word_size (itself EEC.SIZE-derived, 1277-1280). FreeBSDs copy of the same shared code added pointer/length range checks and u32 indexing; DragonFlys 2017 snapshot lacks them. Crafted/corrupt NVM -> checksum computed over wrong words: attach-time validate (if_ix.c:615) wrongly fails (NIC-disable DoS) or wrongly passes; update path (ixgbe_common.c:2320-2346) writes a wrong checksum into NVM (persistent corruption). Hardware-gated: guest has no ixgbe device (env.txt). fix.diff (upstream bounds) compile-validated -Werror-clean on md5-identical guest source.",
  "exploit_chain": "",
  "evidence": "VERDICT.md (walk-through + upstream diff excerpt); build_patched.log; env.txt",
  "kernel_refs": [
    "sys/dev/netif/ix/ixgbe_common.c:2211",
    "sys/dev/netif/ix/ixgbe_common.c:2233",
    "sys/dev/netif/ix/ixgbe_common.c:2250",
    "sys/dev/netif/ix/ixgbe_common.c:1277",
    "sys/dev/netif/ix/ixgbe_common.c:2320",
    "sys/dev/netif/ix/if_ix.c:615"
  ],
  "poc_changes": "New pass-2 finding, no seed. fix.diff authored from upstream FreeBSDs bound checks, minimized to local style.",
  "attempts": 1,
  "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,
  "build_cmd": "cd /usr/src && patch -p1 < fix.diff && cd sys/dev/netif/ix && make obj && make",
  "run_cmd": "n/a (needs ixgbe NIC with crafted NVM)",
  "code_hash": "fb2f27f9401e883665c74821f4d06a933980b11b6cc120142bc7097e56284ba6",
  "notes": "Same trust class as DF-3642 (e1000 flash erase). Divergence diff stored at /tmp/opencode/fx_ixgbe_common.c during the run; excerpt embedded in VERDICT.md.",
  "recommended_fix": "Import upstream bounds: reject pointer >= word_size and length >= word_size - pointer before the walk (fix.diff).",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "Compile-validated only; runtime validation needs hardware.",
  "fix_evidence": "build_baseline.log / build_patched.log (-Werror clean with fix)."
}