This out of tree driver suggests it's a RTL8153 device under the covers:
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cdc_ether fills kernel log
Status in linux package in Ubuntu:
On my Lenovo X1 4th gen with a dock attached:
[ 1764.086306] cdc_ether 2-4.1.3:2.0 enx0050b6d331fe: kevent 11 may have been
[ 1764.150317] cdc_ether 2-4.1.3:2.0 enx0050b6d331fe: kevent 11 may have been
The USB Ethernet device would warn occasionally under the 4.4 kernel. Under
the 4.8 kernel, it spams my kernel log so much that I don't get anything else.
$ uname -a
Linux aurora 4.8.0-11-generic #12-Ubuntu SMP Sat Sep 17 20:00:03 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Yakkety Yak (development branch)
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