Security News > 2021 > November > New Rowhammer Technique

Rowhammer is an attack technique involving accessing - that's "Hammering" - rows of bits in memory, millions of times per second, with the intent of causing bits in neighboring rows to flip.

All previous Rowhammer attacks have hammered rows with uniform patterns, such as single-sided, double-sided, or n-sided.

In all three cases, these "Aggressor" rows - meaning those that cause bitflips in nearby "Victim" rows - are accessed the same number of times.

Research published on Monday presented a new Rowhammer technique.

The non-uniform patterns work against Target Row Refresh.

Abbreviated as TRR, the mitigation works differently from vendor to vendor but generally tracks the number of times a row is accessed and recharges neighboring victim rows when there are signs of abuse.

News URL

https://www.schneier.com/blog/archives/2021/11/new-rowhammer-technique.html