New Rowhammer Attack Variant Out May 26, 2021 11:11 GMT · Comment
Rowhammer Attacks A Google team of security researchers demonstrated another form of the Rowhammer attack that circumvents all known safeguards to modify data stored in memory. The new Rowhammer approach, dubbed Half-Double, is based on weak coupling between two rows of memory that are not directly neighboring but are one row apart. Researchers noted, "Unlike TRRespass, which exploits the blind spots of manufacturer-dependent defenses, Half-Double is an intrinsic property of the underlying silicon substrate". "This is likely an indication that the electrical coupling responsible for Rowhammer is a property of distance, effectively becoming stronger and longer-ranged as cell geometries shrink down. Distances greater than two are conceivable".