# DF-1905 VERDICT

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

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

**Mechanism:** acpi_dock_attach L518-519 AcpiInstallNotifyHandler(h,ACPI_ALL_NOTIFY,acpi_dock_notify_handler,dev). acpi_dock_detach L524-533 only sysctl_ctx_free never calls AcpiRemoveNotifyHandler. device_detach su

**Citation:** `sys/dev/acpica/acpi_dock/acpi_dock.c:518-533`

**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.