Use-after-free vulnerability in the kvm_ioctl_create_device function in virt/kvm/kvm_main.c in the Linux kernel before 4.8.13 allows host OS users to cause a denial of service (host OS crash) or possibly gain privileges via crafted ioctl calls on the /dev/kvm device.
https://github.com/torvalds/linux/commit/a0f1d21c1ccb1da66629627a74059dd7f5ac9c61
https://bugzilla.redhat.com/show_bug.cgi?id=1414506
http://www.securityfocus.com/bid/95672
http://www.openwall.com/lists/oss-security/2017/01/18/10
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.13