An issue was discovered in the Linux kernel before 5.8.10. virt/kvm/kvm_main.c has a kvm_io_bus_unregister_dev memory leak upon a kmalloc failure, aka CID-f65886606c2d.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-23854
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.10