When we speak of security exploits, we usually refer to software that take advantage of vulnerabilities in other software. Rowhammer, however, is a rare breed. Discovered almost exactly a year ago, it involved software exploiting vulnerability in hardware, in this case, dual in-line memory modules or DIMMs, in order to affect a change in software. The exploit had chip makers scrambling to get the latest DDR4 chips out the door. But apparently, the security comforts they offered were based on a presumption that researchers are now proving to be false.
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https://www.slashgear.com/rowhammer-vulnerability-still-threatens-ram-even-ddr4-18432250/
