# DF-1763 — Verdict

**Severity:** Low
**Status:** REPRODUCED (source-only confirmation — driver/HW-gated, not runtime-triggered on QEMU guest)
**Impact:** leak:240
**Confidence:** certain

## Verdict
REPRODUCED. The cited bug is confirmed real in the audited source at `sys/dev/disk/vpo/immio.c:702`.

## Mechanism
CDB-send loop bounded by clen from csio->cdb_len (u8 0-255) without validation against CAM_MAX_CDBLEN=16; clen>16 reads adjacent csio fields and ships to drive via imm_outstr.

## Fix
Clamp clen to 16 (CAM_MAX_CDBLEN) at entry.

The full git-apply-able diff is in `fix.diff`.

## Build validation
fix.diff applies cleanly and compiles with `-Werror` as part of the batch module build
(all 51 fixes applied to /usr/src, kernel+modules built).

## Notes
Source-only confirmation: this finding is in a device driver code path that requires
specific hardware not present in the QEMU guest. The bug is confirmed by source tracing
(cited path:line verified against sys/), and the fix compiles clean. No runtime trigger
was attempted as the relevant device/module is HW-gated.