# DF-2006 - Source Verification

## Verdict: REPRODUCED (source-only confirmation)

**Finding**: sys/dev/acpica/aibs/atk0110.c:170-171

**Mechanism**: aibs_attach_sif derefs bp->Package.Elements[0] without checking Package.Count>=1. Zero-element ACPI package → Elements points past buffer → heap OOB read.

**Hardware dependency**: Requires ASUS ATK0110 ACPI with malicious SIF method.

**Fix**: Add bp->Package.Count < 1 check before Elements[0] dereference.

## Verification method
Source-only confirmation. The cited code path was traced line-by-line in the
audited sys/ tree. The bug exists exactly as described. This is a HW-gated
driver finding — the vulnerable code path requires specific hardware (GPU,
controller, PHY, TPM, etc.) not present in the QEMU audit guest. Runtime
reproduction on this guest is not possible without the hardware.

## Fix validation
fix.diff authored and applied to guest source. All 40 fixes in this batch
compile cleanly in a single combined kernel build: `make -j6 nativekernel
KERNCONF=X86_64_GENERIC` → rc=0, zero -Werror violations.

**Kernel**: DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026