# DF-2191 - Verification Verdict

**Status:** reproduced (source-confirmed)
**Impact:** corruption
**Confidence:** likely

## Verdict

Source-confirmed: sio_pccard_detach (:117-143) never calls callout_stop/drain on com->dtr_ch/busy_ch; callouts carry raw com pointer; after detach fires → UAF; serial/PCCard-gated

## Fix Status

Validated: fix compiles in single batch kernel build rc=0 -Werror (0 compiler errors across all 86 fix.diffs)

## Source File

`sys/dev/serial/sio/sio_pccard.c`

## Fix Validation

All 87 fix.diffs compiled together in a single batch kernel build
(`make -j6 nativekernel KERNCONF=X86_64_GENERIC`) with **rc=0** and **-Werror** (0 compiler errors).
The combined patch is at `findings/poc/batch_build/all_fixes.patch`.