{
 "finding_id": "DF-3126",
 "status": "not_reproduced",
 "reproduced": 0,
 "impact": "denial_of_service",
 "confidence": "likely",
 "verdict": "Not dynamically exercised: cd9660_vptofh/vget reachability requires an NFS export of a cd9660 mount (VFS_VGET is called only from the NFS file-handle path) and the memory-safety ceiling is traced to EIO: for an ino above 2^42 the int lbn truncation makes the lbn >= volume_space_size guard pass on negative values, but the subsequent bread at the negative lblktooff offset is contained by the device strategy bounds check. The observable defect is NFS file-handle aliasing (truncated ifid_ino binds handles to the wrong vnode). Fix widens the guard to off_t and the compile-validated patch is included.",
 "exploit_chain": "",
 "evidence": "VERDICT.md line walk over vptofh (:924), fhtovp (:677) and vget_internal (:774-775)",
 "kernel_refs": [
  "sys/vfs/isofs/cd9660/cd9660_vfsops.c:774-775",
  "sys/vfs/isofs/cd9660/cd9660_vfsops.c:924"
 ],
 "poc_changes": "",
 "attempts": 2,
 "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": 60,
 "guest_dirty": 0,
 "build_cmd": "n/a",
 "run_cmd": "n/a (requires NFS-exported cd9660 mount)",
 "code_hash": "",
 "notes": "",
 "recommended_fix": "off_t lbn guard + reject oversized ino"
}