Our work shows that it is possible to trigger Rowhammer bit flips on DDR4 devices on AMD Zen 2 and Zen 3 systems despite deployed TRR mitigations. This result proves that AMD systems are equally vulnerable to Rowhammer as Intel systems, which greatly increases the attack surface, considering today’s AMD market share of around 36% on x86 desktop CPUs. This poses a significant risk as DRAM devices in the wild cannot easily be fixed, and previous work showed that Rowhammer attacks are practical, fo...