An issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/vdpa.c has a use-after-free because v->config_ctx has an invalid value upon re-opening a character device, aka CID-f6bbf0010ba0.
https://security.netapp.com/advisory/ntap-20210513-0005/
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.9