# DF-3374 -- VERDICT

**REPRODUCED** (impact=none, confidence=certain)
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
ieee80211_parse_csaparams consumes csa_mode/csa_newchan/csa_count with no frm[1] validation (caller passes scan.csa straight from the beacon walk). Verbatim harness: CSA IE len=1 and len=2 both fault the guard page - the channel-switch decision is driven by stale mbuf bytes.

## How it was verified
- Method: Verbatim-interposition harness (guard-page technique; no wlan/sppp hardware on this guest)
- Kernel references: sys/netproto/802_11/wlan/ieee80211_sta.c:1146-1200, sys/netproto/802_11/wlan/ieee80211_sta.c:1472, sys/netproto/802_11/ieee80211.h:1063-1069, sys/netproto/802_11/wlan/ieee80211_input.c:565
- Evidence: cases 1,2 rc=139; control (len=3) rc=0; FIXED length check clean
- 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: fixed -- Harness A/B (fixruns.log): the FIXED build - carrying the natural one-line fix in the same verbatim code - runs clean on the exact input that faults the stock build. Kernel not rebuilt for these Low/hardening items.
fix.diff: natural one-line/class fix authored against the read-only sys/ tree (never applied there).


## 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.