The Project Zero blog explains
that, on 64-bit Arm systems, the kernel's direct map is always placed at
the same virtual location, regardless of whether kernel address-space
layout randomization (KASLR) is enabled.

While it remains true that KASLR should not be trusted to prevent
exploitation, particularly in local contexts, it is regrettable
that the attitude around Linux KASLR is so fatalistic that putting
in the engineering effort to preserve its remaining integrity is
not considered to be worthwhile. The joint effect of these two
issues dramatically simplified what might otherwise have been a
more complicated and likely less reliable exploit.

https://lwn.net/Articles/1044867/
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