Solana's Noisy Neighbor Attack: How Localized Fee Markets Let Attackers Block Your DeFi Liquidations — And the Detection Toolkit to Stop Them

Solana's Noisy Neighbor Attack: How Localized Fee Markets Let Attackers Block Your DeFi Liquidations TL;DR: Solana's Localized Fee Markets (LFM) solved global congestion — but introduced a surgical denial-of-service vector. By flooding write-locks on a single protocol's state accounts, an attacker can price out keeper bots during the exact moments liquidations matter most. We break down the attack mechanics, show real detection patterns, and provide a state-sharding migration guide. The Promise That Became a Weapon When Solana introduced Localized Fee Markets via SIMD-0110, it was hailed as an elegant solution to network-wide congestion. Instead of every transaction competing in a single global fee auction, fees became localized — you only paid premium rates when contending for the same state accounts as other transactions. The theory was sound: a spike in NFT minting shouldn't make your DeFi swap expensive. Each "hot" account gets its own micro-market. But here's the thing about micro