# DF-1883 VERDICT

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

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

**Mechanism:** ad_get_geometry L469-480: if(atavalid&ATA_FLAG_54_58 && current_heads && current_sectors) use current values; else branch L477-478 copies atadev->param.heads/sectors directly into adp->heads/sectors w

**Citation:** `sys/dev/disk/nata/ata-disk.c:147-479`

**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.