A memory leak in the qrtr_tun_write_iter() function in net/qrtr/tun.c in the Linux kernel before 5.3 allows attackers to cause a denial of service (memory consumption), aka CID-a21b7f0cff19.
https://usn.ubuntu.com/4258-1/
https://security.netapp.com/advisory/ntap-20191205-0001/
https://github.com/torvalds/linux/commit/a21b7f0cff1906a93a0130b74713b15a0b36481d