wireguard-install: Kernel module doesn't load on Fedora/CentOS

SOLUTION: Running dnf update or yum update to get an up-to-date kernel and matching headers solves the issue.

Though:

[root@fedora-2gb-nbg1-1 ~]# dkms status
wireguard, 0.0.20190702: added

i have also big problem with CentOS 7, it dont work. i have some wireguards working fine with kernel wireguard, 0.0.20200215, 3.10.0-1062.12.1.el7.x86_64, x86_64: installed

but now i try on an another VPS, but it dont work…

Your kernel headers for kernel 3.10.0-1062.12.1.el7.x86_64 cannot be found at /lib/modules/3.10.0-1062.12.1.el7.x86_64/build or /lib/modules/3.10.0-1062.12.1.el7.x86_64/source.

I have similar problem, but get different verbose output from modprobe:

# modprobe -vvv wireguard
modprobe: INFO: custom logging function 0x55cf4e172a20 registered
insmod /lib/modules/5.3.11-300.fc31.x86_64/kernel/net/wireguard.ko.xz  
modprobe: INFO: Failed to insert module '/lib/modules/5.3.11-300.fc31.x86_64/kernel/net/wireguard.ko.xz': Operation not permitted
modprobe: ERROR: could not insert 'wireguard': Operation not permitted
modprobe: INFO: context 0x55cf4eb9b4c0 released

Any ideas how to get wireguard module loaded? I removed it and rebuild it without success:

dkms remove -m wireguard -v 0.0.20191012 -k 5.3.11-300.fc31.x86_64
dkms install -m wireguard -v 0.0.20191012

Any help us much appreciated.

Having the same problem on Fedora 29, but my kernel headers and active kernel are the same. It seems to be failing because DKMS can’t find the file:

[#] ip link add wg0-client-test type wireguard
Error: Unknown device type.
Unable to access interface: Protocol not supported
[#] ip link delete dev wg0-client-test
Cannot find device "wg0-client-test"
[ben@localhost ~]$ 
[ben@localhost ~]$ dkms status
Error! Could not locate dkms.conf file.
File: /var/lib/dkms/wireguard/0.0.20190702/source/dkms.conf does not exist.

Looks like it’s trying to follow a broken symlink:

[ben@localhost ~]$ ll /var/lib/dkms/wireguard/0.0.20190702/source
lrwxrwxrwx. 1 root root 31 Jul  8 12:18 /var/lib/dkms/wireguard/0.0.20190702/source -> /usr/src/wireguard-0.0.20190702```

the symlink shouldn't be broken tho as the target exists:

```[ben@localhost ~]$ ll /usr/src/wireguard-0.0.20190905/
total 268K
drwxr-xr-x.  6 root root 4.0K Sep 10 09:28 .
drwxr-xr-x.  5 root root 4.0K Sep 10 09:28 ..
-rw-r--r--.  1 root root  11K Sep  9 14:44 allowedips.c
-rw-r--r--.  1 root root 1.8K Sep  9 14:44 allowedips.h
...

I manually removed the broken link and recreated it: sudo ln -s /usr/src/wireguard-0.0.20190905/ /var/lib/dkms/wireguard/0.0.20190702/source

Now DKMS is happy. I rebuilt the modules: sudo dkms autoinstall

Checked status:

wireguard, 0.0.20190702, 5.2.11-100.fc29.x86_64, x86_64: built
wireguard, 0.0.20190905, 5.2.11-100.fc29.x86_64, x86_64: installed

And it still doesn’t work.

lsmod shows it isn’t actually loaded. Loading it fails:

modprobe: ERROR: could not insert 'wireguard': Operation not permitted

No idea why it’s failing.

OK, the kernel and headers were not the same version:

[root@centos-2gb-nbg1-1 ~]# yum list | grep kernel-headers
kernel-headers.x86_64                   3.10.0-957.27.2.el7            @updates
[root@centos-2gb-nbg1-1 ~]# uname -a
Linux centos-2gb-nbg1-1 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[root@fedora-2gb-nbg1-1 ~]# dnf list | grep kernel-headers
kernel-headers.x86_64                                                  5.2.5-200.fc30                                             @updates
[root@fedora-2gb-nbg1-1 ~]#
[root@fedora-2gb-nbg1-1 ~]# uname -a
Linux fedora-2gb-nbg1-1 5.1.16-300.fc30.x86_64 #1 SMP Wed Jul 3 15:06:51 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux