CVE-2024-53123

Summary

CVE-2024-53123 is a vulnerability in the Linux kernel's MPTCP protocol. A division by zero error was discovered in the '__tcp_select_window' function of net/ipv4/tcp_output.c. This error occurs when sk_wait_data() returns with an error and the underlying socket has been disconnected, resulting in a zero rcv_mss. The vulnerability was reported by Eric and confirmed by syzkaller. The root cause is the current handling of racing disconnects, and the recommended mitigation is to return without performing any additional operations on the current socket when such an error occurs.

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