In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent NULL dereference in nfsd4_process_cb_update() @ses is initialized to NULL. If __nfsd4_find_backchannel() finds no available backchannel session, setup_callback_client() will try to dereference @ses and segfault.
https://git.kernel.org/stable/c/eb51733ae5fc73d95bd857d5da26f9f65b202a79
https://git.kernel.org/stable/c/d9a0d1f6e15859ea7a86a327f28491e23deaaa62
https://git.kernel.org/stable/c/cac1405e3ff6685a438e910ad719e0cf06af90ee
https://git.kernel.org/stable/c/c5d90f9302742985a5078e42ac38de42c364c44a
https://git.kernel.org/stable/c/752a75811f27300fe8131b0a1efc91960f6f88e7
https://git.kernel.org/stable/c/4a4ffc1aa9d618e41ad9151f40966e402e58a5a2
https://git.kernel.org/stable/c/1e02c641c3a43c88cecc08402000418e15578d38
https://git.kernel.org/stable/c/0c3b0e326f838787d229314d4de83af9c53347e8
https://git.kernel.org/stable/c/03178cd8f67227015debb700123987fe96275cd1