{
  "finding_id": "DF-5461",
  "status": "untested",
  "reproduced": false,
  "impact": "none",
  "confidence": "likely",
  "verdict": "Trace-proven: the hz/4 timeout path (ichsmb.c:643-648) neither aborts the in-flight hardware transaction (ICH_HST_CNT_KILL never used) nor fences late completions, so a stale INTR can complete the NEXT transaction with SMB_ENOERR and stale/zero data. Cannot be reproduced on the QEMU rig (slaves complete immediately; no way to stall an emulated SMBus transfer past hz/4). Low severity, fault/precondition-gated data-integrity bug (ig4 DF-5386/5389 family).",
  "exploit_chain": "",
  "evidence": "README.md trace; ichsmb.c:602-609 (INTR completes whatever ich_cmd is set), 637 (single hz/4 sleep), 643-648 (timeout resets ich_cmd only)",
  "kernel_refs": ["sys/bus/smbus/ichsmb/ichsmb.c:637","sys/bus/smbus/ichsmb/ichsmb.c:643","sys/bus/smbus/ichsmb/ichsmb.c:646","sys/bus/smbus/ichsmb/ichsmb.c:602","sys/bus/smbus/ichsmb/ichsmb_reg.h:80"],
  "poc_changes": "",
  "attempts": 0,
  "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": 0,
  "guest_dirty": 0,
  "build_cmd": "", "run_cmd": "", "code_hash": "",
  "notes": "Low-severity data-integrity finding; live PoC not feasible on the rig (needs a bus that stalls >250ms).",
  "recommended_fix": "On ichsmb_wait timeout: write ICH_HST_CNT_KILL, clear HST_STA, and fence stale completions (generation token checked by the ISR before wakeup).",
  "fix_status": "not_tested", "fix_baseline_reproduced": false, "fix_patched_reproduced": false,
  "fix_verdict": "", "fix_evidence": ""
}