{
 "finding_id": "DF-4676",
 "poc_id": "DF-4676",
 "status": "untested",
 "reproduced": 0,
 "impact": "cmx_kqfilter is the only entry without the sc/dying guard - kevent after card detach dereferences the NULL softc (panic). Root-only device + physical removal",
 "confidence": "certain",
 "attempts": 0,
 "guest_uname": null,
 "code_hash": null,
 "exploit_chain": [],
 "evidence": "No device_busy so detach is not blocked by open fds; the filter_read itself defensively NULL-checks (author knew) but registration does not. Guard fix.",
 "kernel_refs": [
  "sys/dev/misc/cmx/cmx.c:665",
  "sys/dev/misc/cmx/cmx.c:682"
 ],
 "verdict": "not_run: needs CardMan 4040 PCMCIA hardware (absent from guest)",
 "fix_status": "not_testable",
 "fix_baseline_reproduced": 0,
 "fix_patched_reproduced": 0,
 "fix_verdict": "not_testable: hardware-gated (no Bt848 / no CardMan on guest)",
 "fix_evidence": "fix in finding markdown"
}