From journal:
Dez 30 02:54:57 i7 kernel: 8812au: loading out-of-tree module taints kernel.
Dez 30 02:54:57 i7 kernel: 8812au: module verification failed: signature and/or
required key missing - tainting kernel

From modinfo:
filename:      
/lib/modules/5.3.18-59.10-preempt/weak-updates/updates/8812au.ko
version:        v5.9.3.2_37279.20201012
author:         Realtek Semiconductor Corp.
description:    Realtek Wireless Lan Driver
license:        GPL
suserelease:    SLE15-SP3
srcversion:     7D315923A72BDFA9B9E716B
...
name:           8812au
vermagic:       5.3.18-57-preempt SMP preempt mod_unload modversions 
sig_id:         PKCS#7
signer:         openSUSE Secure Boot CA
sig_key:        FA:BE:D8:BF:40:9A:5E:64
sig_hashalgo:   sha256
signature:      7D:90:7B:D0:1C:98:C1:8C:D9:96:F2:AA:C4:E6:6F:B3:DB:D1:5A:F7:
        9F:7D:34:75:70:8B:41:A5:48:D8:A3:B4:EB:31:7C:03:BF:BD:83:73:
        59:F7:55:56:1C:88:C7:71:9E:48:C2:97:C6:DA:78:D1:86:EC:0A:E4:
        62:AC:A4:75:65:D6:FD:99:46:29:B6:F0:DD:4B:19:99:CD:95:93:07:
        8B:32:79:BE:69:5A:31:95:60:30:CF:D7:1F:DD:76:82:33:D6:75:76:
        ED:03:65:2E:31:9C:F8:1D:FE:40:12:44:E7:63:B1:8C:60:29:54:A5:
        8A:A8:FB:86:42:A4:52:99:E3:70:60:BF:36:E7:68:7D:32:3E:5A:BA:
        EE:89:BB:2A:13:8B:BF:70:D9:9A:C8:BD:3B:A1:45:EA:EB:F8:37:C6:
        BE:CC:F8:B7:68:C5:C6:29:1A:95:87:0E:F0:44:7A:C7:6B:F4:E1:43:
        86:26:63:C5:FB:4F:69:28:7F:72:20:02:CB:C2:04:32:3D:4C:6F:74:
        8A:D4:18:26:4D:09:73:EC:5B:E0:50:44:F7:3D:C4:09:B8:94:5B:95:
        DD:E6:0D:95:86:1D:78:77:7C:B8:3B:DC:88:AA:C2:29:29:DB:21:75:
        3F:7E:3B:4A:55:F7:B9:F3:89:33:B4:E3:A9:F1:68:C2
...

So what is the problem? Signature or path?
Kernel is inux i7.site 5.3.18-59.10-preempt #1 SMP PREEMPT Fri Jun 25 12:36:56
UTC 2021 (6856d31) x86_64 x86_64 x86_64 GNU/Linux