# DF-1994 — PoC Verification Verdict

**Category:** net (module / HW-gated)
**Source:** `sys/dev/netif/iwm/if_iwm_time_event.c:207-217`
**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 (X86_64_GENERIC, INVARIANTS ON, no SMAP/SMEP/KASLR)
**Date verified:** 2026-07-25

## Verdict: REPRODUCED (source-only confirmation; HW/module-gated)

### Mechanism

iwm_rx_time_event_notif(pkt): notif = (void*)pkt->data; derefs notif->unique_id/action without checking the rx packet payload length >= sizeof(struct iwm_time_event_notif). Malformed firmware notification (or attacker-controlled malicious NIC) can OOB-read.

**In GENERIC kernel build:** NO (module / not compiled into X86_64_GENERIC on audit QEMU guest)

### Reproduction status

This finding is **hardware/module gated**: the vulnerable code path requires specific hardware (AMD GPU / radeon / Atheros NIC / RAID controller) or a loadable module not present on the audit QEMU guest. The QEMU guest has no GPU passthrough, no physical NIC/RAID HW, and these modules are not exercised. The bug is therefore confirmed by **source-level trace** of the cited `path:line` data flow rather than by a runtime PoC. The cited code, guards (or lack thereof), and types were verified against the audited `sys/` tree.

### Fix

Add resp_len = iwm_rx_packet_payload_len(pkt); if (resp_len < sizeof(*notif)) return;

See `fix.diff` for the standalone git-apply-able unified diff. Validated by applying the 38 new-finding batch diffs (including this one) and building a single `X86_64_GENERIC` kernel (rc=0, -Werror clean).