Removing old kernels using dnf leaves files in /boot

[Clemens Eisserer]

Hi,

Because I run my linux installation on "real" hardware as well as
using VirtualBox I need manual control when old kernels (which have
vbox extensions) are removed.
Recently I tried to remove old kernel packages with dnf ("dnf remove
kernel-4.1.3-201.fc22"), yet the files contained in this package are
still in /boot:

[root@user-pc boot]# ls -la /boot/vmlinuz-4.1.3-201.fc22.x86_64
-rwxr-xr-x. 1 root root 5968568 Jul 29 21:59 /boot/vmlinuz-4.1.3-201.fc22.x86_64

Any idea what could be going wrong here?

Thank you in advance, Clemens