Bitcoin Core and Lightning developer Matt Corallo highlighted a severe Linux kernel vulnerability on October 30, criticizing Ubuntu’s delayed response to what he called “the most critical Linux vuln ever.” The bug, tracked as CVE-2026-98432, affects the kernel’s IPv4 TCP handshake code with a CVSS severity score of 9.8. Anthropic’s Frontier Red Team later showed it could be turned into a remote root exploit against systems exposing a Multipath TCP (MPTCP) listener.

Peter Todd echoed the warning the same day, advising anyone running LND on Linux with open ports to shut their Bitcoin Lightning nodes down until the kernel was patched or otherwise mitigated. The demonstrated…

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