# DF-2109 - Verification Verdict

**Status:** reproduced (source-confirmed)
**Impact:** none
**Confidence:** likely

## Verdict

Source-confirmed: radix_max (:45) computes 1UL<<(height*6)-1; when height==RADIX_TREE_MAX_HEIGHT(11), shift=66 >= 64 is UB; DRM-module-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_radix.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`.