{
 "finding_id": "DF-3246",
 "status": "reproduced",
 "reproduced": 1,
 "impact": "none",
 "confidence": "certain",
 "verdict": "Reproduced on the stock INVARICTIONS guest with a minimal crafted plain ISO9660 image (no RRIP/Joliet) holding one file stored as NAME;1: stat(/mnt/NAME;4294967297) SUCCEEDS (returns the inode of NAME;1) while the controls behave correctly - NAME;2 -> ENOENT, NAME;4294967298 (wraps to 2) -> ENOENT, NAME;0000000001 (10-digit but i==1) matches legitimately. 4294967297 = 2^32+1 wraps the int accumulator at cd9660_util.c:118 (i = i*10 + *fn++ - 0) to 1, matching the image-side j=1 via return i - j (:127); cd9660_lookup.c:233 treats 0 as an exact match. Signed overflow is UB; on this compiler it wraps. Post-fix A/B on F40FIX: NAME;4294967297 -> ENOENT (version field refused as too large).",
 "exploit_chain": "",
 "evidence": "VERDICT.md with path:line citations; run.log where a live demo exists; fix.diff",
 "kernel_refs": [
  "sys/vfs/isofs/cd9660/cd9660_util.c:118",
  "sys/vfs/isofs/cd9660/cd9660_util.c:123",
  "sys/vfs/isofs/cd9660/cd9660_util.c:127",
  "sys/vfs/isofs/cd9660/cd9660_lookup.c:233"
 ],
 "poc_changes": "image generator written (host python): PVD@16/VDST@17/root@32/data@33; first two generator attempts had wrong root-record offset (must be PVD byte 156) and wrong dirrec length byte - fixed",
 "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": 15,
 "guest_dirty": 0,
 "build_cmd": "see build.sh",
 "run_cmd": "see run.sh",
 "code_hash": "e6a983221561ce2d6721b17e102cdc9cac8681cfa82fb104aceb3f81715e7089",
 "notes": "",
 "recommended_fix": "refuse version fields whose accumulation would overflow int (both user and image sides)",
 "fix_status": "fixed",
 "fix_verdict": "A/B complete: NAME;4294967297 now ENOENT on F40FIX (was a false-positive match on stock); NAME;1 still resolves (no regression)."
}