# DF-1898 VERDICT

**Verdict:** REPRODUCED (source-confirmed)

**Impact:** Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

**Mechanism:** iwm_phy_db_set_section L264-328 parses firmware IWM_CALIB_RES_NOTIF_PHY_DB notification (pkt->data <=4KB mbuf cluster IWM_RBUF_SIZE=4096) but NEVER calls iwm_rx_packet_payload_len(pkt) (helper exists 

**Citation:** `sys/dev/netif/iwm/if_iwm_phy_db.c:268-389`

**Fix:** Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

**Verification method:** Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.