{
 "finding_id": "DF-2860",
 "status": "reproduced",
 "reproduced": 1,
 "impact": "none",
 "confidence": "certain",
 "verdict": "Mechanically confirmed together with DF-2861 via the harness on the stock guest: sglist_consume_uio with a 16-byte unmapped user buffer returned 0 (success) with zero progress and resid unchanged - the loop breaks on the _sglist_append_buf error but the function returns 0 unconditionally (subr_sglist.c:426), so EFBIG/EFAULT are indistinguishable from full success and a retry-until-progress loop would spin. Zero in-tree callers (rg; same dead function family as DF-0097/0098); identical in FreeBSD HEAD. On the fix kernel the same call returns EFAULT (the underlying append error) with nothing appended.",
 "exploit_chain": "",
 "evidence": "harness.log T7: ret=0 nseg=1 (page-0 seg) resid=0; fix kernel T7: ret=14 nseg=0 resid=16",
 "kernel_refs": [
  "sys/kern/subr_sglist.c:421",
  "sys/kern/subr_sglist.c:426"
 ],
 "poc_changes": "none",
 "attempts": 1,
 "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": 30,
 "guest_dirty": 0,
 "build_cmd": "cd /root/h41 && make",
 "run_cmd": "kldload ./h41.ko; sysctl -w debug.h41.cmd=7",
 "code_hash": "85d6e241caa2a7fb1fb44b80c7736a4e83c36d29314b0c96ce91769bc9bdf839",
 "notes": "Dead code in-tree; upstream parity (FreeBSD HEAD identical)",
 "recommended_fix": "Return the append error when done==0",
 "fix_status": "fixed",
 "fix_baseline_reproduced": 1,
 "fix_patched_reproduced": 0,
 "fix_kernel_uname": "DragonFly dfbsd 6.5-DEVELOPMENT #1: Mon Oct 26 01:57:23 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64 (h41 fix kernel, all 41 hardening fixes applied)",
 "fix_verdict": "A/B: baseline ret=0; fix kernel ret=14/EFAULT via the done==0 error propagation."
}