# DF-3348 -- 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
lagg_sysctl_active walks sc_ports with no LAGG lock (if_lagg.c:1620-1638) and lagg_port_destroy swaps if_ioctl/if_output/if_lagg without the port serializer. Race attempted live: 4000 sysctl walks against 300 port add/remove cycles - no crash (the freed lp is slab-contained and the window needs packet traffic in flight during teardown). Mechanism line-confirmed.

## How it was verified
- Method: Code-line analysis + attempted live reproduction
- Kernel references: sys/net/lagg/if_lagg.c:1620-1638, sys/net/lagg/if_lagg.c:755-775
- Evidence: run log in VERDICT.md (lagg_race.sh: sysctl=net.link.lagg.0.active, 4000 walks, no crash)
- 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: LAGG_RLOCK around the sysctl walk (and hold the port serializer across the if_* swap); not A/B-able without a crash oracle.



## 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.)