A memory leak in the ath9k_wmi_cmd() function in drivers/net/wireless/ath/ath9k/wmi.c in the Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption), aka CID-728c1e2a05e4.
https://www.oracle.com/security-alerts/cpuApr2021.html
https://usn.ubuntu.com/4527-1/
https://usn.ubuntu.com/4526-1/
https://security.netapp.com/advisory/ntap-20191205-0001/
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
https://github.com/torvalds/linux/commit/728c1e2a05e4b5fc52fab3421dce772a806612a2
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html