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Archive for February 28, 2016

Apple security update blocks Apple Ethernet drivers on OS X El Capitan

February 28, 2016 9 comments

Over the weekend, Apple released an update for a kernel extension blacklist used by System Integrity Protection on OS X El Capitan. This blacklist is a security measure to help Apple block kernel extensions which have been found to be harmful or problematic for OS X. This update belonged to a category of updates which Apple has set to install automatically and in the background, so its installation would have been both automatic and invisible.

Unfortunately, this blacklist update appears to have inadvertently contained the kernel extension information for Apple’s own Ethernet drivers. This is a problem because blocking the Ethernet drivers means your Mac will not be able to connect to your network via an Ethernet connection.

Apple appears to have quickly recognized the problem and has released a follow-up update which fixes this issue.


Update – 10-28-2016: Apple has posted a knowledgebase article about this issue: https://support.apple.com/HT6672


The good news:

  1. This issue does not affect your Mac’s WiFi connection. WiFi has separate drivers which were not affected.
  2. If the Ethernet drivers are blocked, but the Mac has not yet rebooted, your Ethernet connection will remain working until the next time the Mac reboots.
  3. The follow-up update which fixes the problem may already be installed on your Mac.

For more information, see below the jump.

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