# DF-2159 - Verification Verdict

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

## Verdict

Source-confirmed: free_irq (:116) walks irq_list with SLIST_FOREACH_MUTABLE WITHOUT irqdata_lock; only takes lock for SLIST_REMOVE (:137); concurrent free/lookup race → UAF; DRM-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/drm/linux_irq.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`.