A flaw was found in the subsequent get_user_pages_fast in the Linux kernel’s interface for symmetric key cipher algorithms in the skcipher_recvmsg of crypto/algif_skcipher.c function. This flaw allows a local user to crash the system.
https://github.com/torvalds/linux/commit/9399f0c51489ae8c16d6559b82a452fdc1895e91