Linux Kernel Vulnerability in MPTCP Protocol Handling

CVE-2025-68227

What is CVE-2025-68227?

A vulnerability exists in the Linux kernel related to improper handling of MultiPath TCP (MPTCP) during protocol fallback. This issue arises when a server has MPTCP enabled, but a client sends a standard TCP SYN packet, leading to incorrect configuration of the socket protocol settings. When the fallback mechanism is triggered, the subflow's protocol can be incorrectly set, resulting in potential network instability or improper resource utilization. This vulnerability highlights a critical flaw in the processing of network sockets, necessitating prompt remedial action to ensure robust network performance.

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