# DF-3463 -- VERDICT

**NOT REPRODUCED** (impact=none, confidence=likely)
Guest: 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

## Summary
gre_input sets m_pkthdr.rcvif = &sc->sc_if (ip_gre.c:192) with no lifetime tie; ip_reass keeps fragments for IPFRAGTTL=60 slow-ticks (~30s) with no per-interface purge, so a fragment riding gre0 survives if_detach and completes reassembly later through freed gre_softc memory. CONTROL PROVEN LIVE: an inner 127.0.0.1 packet fragmented through gre0 is rejected by the :544 rcvif->if_flags read (mechanism exercised); after destroy+reassembly the read demonstrably happens again on freed memory - but with identical rejection outcome (freed slab retains the old flags), and 20 aggressive recycle attempts (24 lo ifnets each, same-zone kmalloc churn) never landed a loopback ifnet at the stale address, so no observable delta/crash.

## How it was verified
- Method: Code-line analysis + attempted live reproduction
- Kernel references: sys/netinet/ip_gre.c:184-193, sys/netinet/ip_input.c:541-548, sys/netinet/ip_input.c:977-1100
- Evidence: live2.log greuaf section: control rejected as expected; attempts 1-20 rejected (no acceptance)
- Reachability: local-unpriv where noted in the summary; root-config for tun/lagg/carp/ipfw3/gre items; remote-facing for the packet parsers (wlan harnesses model the RX/TX path verbatim because the guest has no 802.11 hardware; precedent DF-0393/DF-0594/DF-0621/DF-0350).
- Privesc assessment: no uid0 chain exists for any finding in this batch -- the memory-safety items are bounded info reads (kernleak bucket) or fault-injection-gated NULL derefs; nothing yields a write primitive or control over privileged state. The one panic-class live item (DF-3414) is root-only (SIOCIFDESTROY).

## Fix
fix_status: not_testable -- Fix: clear/purge reass queues on if_detach or take an ifnet reference for queued fragments; not A/B-able without an observable recycle.



## Fix status (batch validation)
Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.

(No fix.diff for this item: documented recommendation only - see Fix above.)