hypervisors (notably QEMU under KVM), allowing a malicious guest to influence speculative execution and leak sensitive host memory. The flaw affects AMD Zen 1-5 and Intel "Coffee Lake" processors, and mitigations include Linux kernel patches that conditionally issue Indirect Branch Prediction Barrier (IBPB) instructions on VMEXITs before returning control to user-space in order to flush predictor state.

2026

In February 2026 at FOSDEM

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