{
  "finding_id": "DF-4315",
  "status": "not_reproduced",
  "reproduced": 0,
  "impact": "none",
  "confidence": "likely",
  "verdict": "OOB-read mechanics proven in source (device-fed 8-bit rs_rate -> rateCodeToIndex[] 0xFF sentinel for codes not in the current mode table -> unchecked sc_hwmap[255] read ~1.8KB past the 32-entry array, at if_ath_rx.c:577-579, 900-903, and via ath_led_event at 990/if_ath_led.c:194), but NOT runtime-reproducible on the audit guest: it has no Atheros NIC (vtnet0/lo0 only, no vendor-0x168c PCI device - run.log/env.txt), so the ath driver cannot attach. Two garbage bytes per frame are exported into the radiotap header visible only to privileged BPF listeners; no write primitive; Low severity.",
  "exploit_chain": "",
  "evidence": "VERDICT.md (sentinel creation at ah.c:573, device-fed field at ar5416_recv.c:200, OOB consumers at if_ath_rx.c:577/900/990 and if_ath_led.c:194, array bound at if_athvar.h:716); run.log (guest precondition check: no ath device); fix.diff (git apply --check clean, sentinel clamp at 3 sites)",
  "kernel_refs": [
    "sys/dev/netif/ath/ath/if_ath_rx.c:577",
    "sys/dev/netif/ath/ath/if_ath_rx.c:900",
    "sys/dev/netif/ath/ath/if_ath_rx.c:990",
    "sys/dev/netif/ath/ath/if_ath_led.c:194",
    "sys/dev/netif/ath/ath/if_athvar.h:716",
    "sys/dev/netif/ath/ath_hal/ah.c:573",
    "sys/dev/netif/ath/ath_hal/ar5416/ar5416_recv.c:200"
  ],
  "poc_changes": "No userspace trigger exists for an RX-path bug fed by hardware descriptors; shipped a precondition probe (trigger.sh) that documents and checks the hardware requirement honestly.",
  "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": 10,
  "guest_dirty": 0,
  "build_cmd": "none (kernel RX path)",
  "run_cmd": "vm.sh run_root ifconfig -l; pciconf -l | grep -i 168c",
  "code_hash": "",
  "notes": "True classification per AGENT.md table: guest reachable but target device absent (no Atheros NIC in QEMU). Reachability on real hardware requires a received frame whose hw rate code is outside the loaded mode table (XR codes on AR5212, MCS above loaded chain count on 11n, scan mode-change windows). Sibling sites outside this file share the pattern (if_ath_tdma.c:407, ath_rate/sample/sample.c:872). Known DF-1517 (rs_datalen) and DF-1667 (EDMA file) are different root causes and not re-reported.",
  "recommended_fix": "Clamp the rateCodeToIndex 0xFF sentinel to index 0 at the three if_ath_rx.c use sites (fix.diff); same clamp advisable in if_ath_tdma.c and ath_rate/sample.",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "fix.diff is git-apply-clean and trivially sound by inspection (index 0 is always populated per if_ath.c:6211-6233); runtime validation impossible on this guest because no ath hardware can attach.",
  "fix_evidence": "fix.diff in this pack; VERDICT.md Fix validation section."
}