CVE-2023-52527

Summary

CVE-2023-52527: A vulnerability in the Linux kernel affects IPv4 and IPv6 packet handling. The issue occurs when appending data to a partially filled packet, causing the transport header length to be included twice. This can lead to a warning message during data transmission when using MSG_SPLICE_PAGES. The issue can be triggered in certain network scenarios, such as L2TP sockets. To mitigate this vulnerability, only add the transport header length to the length if the write queue is empty in the affected function. This issue does not affect IPv6 packet handling in l2tp_ip_sendmsg, as it builds the UDP packet itself.

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