nginx might not, but some automated tool / cron job using libguestfs might. Kernel KVM has a very good record for security so it's not something to worry about

nginx might not, but some automated tool / cron job using libguestfs might. Kernel KVM has a very good record for security so it's not something to worry about, compared to (for example) lesser used drivers/filesystems or other dusty corners of the kernel.