Add kernelCTF CVE-2026-23278_cos (#exp462)#374
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Replace hardcoded CORE_PATTERN_PHYS and struct unix_address_user / BIND_LEN with per-target kernelXDK definitions using AddSymbol and AddStruct, following the recommended pattern from the libxdk sample exploit documentation. Update exploit.md line references and code blocks to match.
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kernelCTF submission for CVE-2026-23278 (nf_tables catchall break-statement UAF).
Submission ID: exp462
Target: cos-121-18867.381.30
Note: vuln-verify CI fails because the fix commit (7cb9a23d7ae4) has not been backported to the 6.6 stable branch yet. It exists in v7.0-rc4 and was backported to v6.12.78+, but not to 6.6.x which COS-121-18867.381.30 is based on.