{
  "finding_id": "DF-4065",
  "status": "untested",
  "attempts": 0,
  "reproduced": 0,
  "confidence": "likely",
  "impact": "Missing linux-4.19.y stable backports 690e0ec8e63d + 85636167e320: legacy ring buffers still allocated from stolen memory and BAR/WC-mapped on LLC platforms (SNB+) - upstream direction never do this on LLC (GPU hangs/wedges, display wedge/GPU DoS).",
  "verdict": "source-verified via full diff vs upstream v4.19 and linux-4.19.y; hardware-gated (no Intel GPU model in QEMU)",
  "exploit_chain": [],
  "evidence": "diff-certain: intel_ringbuffer.c:1096/:1131/:1148 lack the !HAS_LLC guards present in linux-4.19.y",
  "kernel_refs": [
    "sys/dev/drm/i915/intel_ringbuffer.c:1096",
    "sys/dev/drm/i915/intel_ringbuffer.c:1131",
    "sys/dev/drm/i915/intel_ringbuffer.c:1148"
  ],
  "guest_uname": "",
  "code_hash": "",
  "artifact_dir": "findings/poc/DF-4065/",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "apply upstream stable pair 690e0ec8e63d + 85636167e320 (three one-line !HAS_LLC guards: stolen alloc gate + pin/unpin BAR-map gates)",
  "fix_evidence": "source-only (upstream diff)"
}