# DF-2139 - Verification Verdict

**Status:** reproduced (source-confirmed)
**Impact:** leak:4bytes
**Confidence:** certain

## Verdict

Source-confirmed: rdrand_rng_harvest (:175-183) kprintf-s first 4 bytes of raw RDRAND output to kernel msg buffer when debug.rdrand>0; same bytes fed to CSPRNG; RNG seed leak; debug-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/crypto/rdrand/rdrand.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`.