That's not entirely accurate. There are a lot of ARM CPUs that are not vulnerable to Spectre, and that includes a lot of them that are in use in actual devices.

That's not entirely accurate. There are a lot of ARM CPUs that are not vulnerable to Spectre, and that includes a lot of them that are in use in actual devices. For example, my phone happens to use a Cortex-A53, which is not vulnerable. It is however easy to miss this detail from their 'security update' [0] because the table doesn't list CPUs that aren't affected. Also, I don't believe the single ARM CPU that's vulnerable to meltdown (Cortex-A75) has actually been included in any devices at this point, so for now it is safe to assume any ARM-based device you have is not vulnerable to meltdown. [0] https://developer.arm.com/support/security-update https://developer.arm.com/support/security-update