{
  "finding_id": "DF-5526",
  "status": "untested",
  "verdict": "untested (Info hardening; needs a non-conforming FXSAVE CPU - the QEMU guest reports a proper mask)",
  "reproduced": false,
  "impact": "MXCSR=0 + SIGFPE on every restore on mxcsr_mask==0 hardware",
  "confidence": "likely",
  "exploit_chain": "",
  "evidence": "static trace + guest-verified negative proofs in finding markdown",
  "kernel_refs": [
    "sys/platform/pc64/x86_64/npx.c:134"
  ],
  "poc_changes": "",
  "attempts": 0,
  "guest_uname": "DragonFly dfbsd 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": "n/a",
  "run_cmd": "n/a",
  "code_hash": "",
  "notes": "Info; Phase V per contract",
  "recommended_fix": "0->0xFFBF fallback in npxprobemask",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "",
  "fix_evidence": ""
}