Add kernelCTF CVE-2026-23351_cos#371
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Novel technique submission for CVE-2026-23351 (nft_set_pipapo GC UAF).
Submission ID: exp475
Novel technique: nft_immediate_eval OOB dreg write. Bypasses stack canaries by writing at a controlled register index (dreg=54) past the canary into saved callee registers on the kernel stack. No stack pivot, no branch to arbitrary code. See docs/novel-techniques.md.
Target: cos-121-18867.381.30