# DF-1931 VERDICT

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

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

**Mechanism:** ath_rate_update L246-269: amn->amn_tx_rix0=sc->sc_rixmap[ni->ni_txrate] then rt->info[amn_tx_rix0].rateCode. sc_rixmap returns 0xff sentinel for rates absent from current PHY mode table (if_ath.c:6200

**Citation:** `sys/dev/netif/ath/ath_rate/amrr/amrr.c:246-269`

**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.