Researchers have significantly increased the scope of the Rowhammer threat
Attack or otherwise, this is ultimately a hardware reliability problem. Any access pattern that can cause bit errors is indicative of faulty memory. If I remember correctly, the original Rowhammer paper shows that RAM from ~2009 and before was completely unaffected. Yet in the continuing quest for higher densities and lower costs (is RAM not cheap enough already?) the manufacturers are sacrificing reliability and correctness, and IMHO that is not acceptable, nor is their insistence that this is not a problem (it seems they were powerful enough to convince one well-known memory testing application to make the RH test optional(!) and spread FUD that it wasn't really a concern if that test failed, because a lot of RAM would fail it.) NO access pattern should ever cause errors to occur on correctly functioning hardware.