ipgre: test csumstart instead of transport header
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.18.4 by commit 0ffa268724656633af5f37a38c212326d98ebe8c, it was introduced in version v5.15 by commit 8a0ed250f911da31a2aef52101bc707846a800ff. For more details please see the references link.