{
 "finding_id": "DF-2893",
 "status": "reproduced",
 "reproduced": 1,
 "impact": "none",
 "confidence": "certain",
 "verdict": "Line-accurate confirmation (no live in-tree trigger - TCPs only concurrent so_rcv mutators are append/compress; soclose sbflush is fp-ref-excluded; the sole live dropper sco_input is bt-hw-gated): sorecvtcp marks mbufs M_SOLOCKED and uiomoves directly out of them with the ssb token released (uipc_socket.c:1740-1778); the only code honoring the flag is sbcompress (uipc_sockbuf.c:376). sbdrop (:473-508), sbdroprecord (:517-535), sbflush (:451-465) and sbunlinkmbuf (:548-578) trim/unlink/free M_SOLOCKED mbufs unchecked - a concurrent flush during the unlocked uiomove would be a kernel UAF read of freed mbuf data to userspace. FIX VALIDATION WAS DECISIVE: the findings suggested shape (KKASSERT M_SOLOCKED==0 in the drop family) PANICKED the fix kernel at boot - sorecvtcp itself legitimately unlinks its own still-flagged mbufs after consuming them (uipc_socket.c:1832-1841), so the flag cannot be asserted at these chokepoints without owner tracking. The assert was reverted; the recorded recommendation is owner-aware checks (record the locking thread in the mbuf or skip-and-requeue semantics).",
 "exploit_chain": "",
 "evidence": "sourcenote.txt: checker-vs-dropper map; VERDICT.md documents the boot panic of fix-v1 (sbunlinkmbuf assert via sorecvtcp) proving the assert approach wrong",
 "kernel_refs": [
  "sys/kern/uipc_sockbuf.c:376",
  "sys/kern/uipc_sockbuf.c:473",
  "sys/kern/uipc_socket.c:1778",
  "sys/kern/uipc_socket.c:1832"
 ],
 "poc_changes": "none",
 "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": 40,
 "guest_dirty": 0,
 "build_cmd": "(source confirmation only)",
 "run_cmd": "(source confirmation only)",
 "code_hash": "70871b17731b66b849b33e798ec652a536fe5e10111b8fe5f96e21b3b1d361bd",
 "notes": "One new protocol or a sorecvtcp conversion turns this into a direct UAF",
 "recommended_fix": "Track the M_SOLOCKED owner thread (or skip-and-requeue); plain asserts at sbdrop/sbflush are wrong (boot-validated)",
 "fix_status": "not_testable",
 "fix_baseline_reproduced": 0,
 "fix_patched_reproduced": 1,
 "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": "Fix-v1 (drop-family KKASSERTs) false-positives on the legitimate owner path and panics at boot - reverted. A correct fix needs M_SOLOCKED ownership tracking; documented as the revised recommendation rather than shipped."
}