New ZenHammer memory attack impacts AMD Zen CPUs

Researchers at ETH Zurich disclosed ZenHammer, a Rowhammer variant that reverse-engineers AMD Zen DRAM addressing and uses novel timing and access patterns to induce bit flips on AMD Zen 2/3/4 platforms with DDR4 and (in limited cases) DDR5, demonstrating simulated privilege-escalation exploits including obtaining root in lab tests and prompting AMD security guidance and mitigations.