Add kernelCTF CVE-2026-23274_cos#352

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pjwhatforlunch wants to merge 8 commits intogoogle:masterfrom

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Commits on Mar 20, 2026

wip: add everything except writup.md for CVE-2026-23274
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Commits on Mar 21, 2026

feat: update compileable exploit.c and full exploit doc
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Commits on Apr 3, 2026

fix: use KASLR leak from libxdk; fine-tune nprem; panic kernel after we got flag
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nperm: fine tune to avoid oom and not hit
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