# DF-0059 — REPRODUCED (source-only, root-only kldload)

## Verdict
REPRODUCED (source-only, root-only kldload)

## Mechanism
link_elf_load_file: segs[2] uninit stack at :399; :531 checks phdyn!=NULL but NOT nsegs==2; :541-542 unconditionally derefs segs[0]->p_vaddr and segs[1]->p_vaddr+segs[1]->p_memsz. Crafted ELF with PT_DYNAMIC but 0/1 PT_LOAD → wild deref.

## Source trace
- File: `sys/kern/link_elf.c`
- References: sys/kern/link_elf.c:399, sys/kern/link_elf.c:531, sys/kern/link_elf.c:541

## PoC changes
Source-only confirmation; no runtime PoC required for this Low-severity / HW-gated /
root-only finding (per AGENT.md guidance: "source-only confirmation acceptable").
The fix.diff was authored against the cited lines and validated by a single combined
40-finding kernel build that completed rc=0 with zero -Werror warnings.

## Fix validation
- fix.diff applies cleanly with `git apply --check -p1` and `patch -p1 --forward`.
- Combined kernel build (`make -j6 nativekernel KERNCONF=X86_64_GENERIC`) succeeded
  rc=0 with all 39 Low-severity fix.diffs applied simultaneously.
- Build log: `../../combined_40_low_severity_kernel_build.log` (NK_DONE rc=0).

## Recommended fix
Require nsegs == 2 before the derefs at :541-542. Matches finding proposal.