The Noisy Neighbor Attack: How Solana's Localized Fee Markets Create a $0.50 Kill Switch for Any DeFi Protocol

The article describes the 'Noisy Neighbor Attack,' a low-cost denial-of-service vector unique to Solana's localized fee market architecture. By flooding write-lock requests against a protocol's shared state accounts (PDAs) for as little as $0.50/second, an attacker can block or drastically increase costs for all legitimate transactions targeting that protocol. Most Solana DeFi protocols with concentrated writable state are vulnerable, making this one of the cheapest and most underappreciated attack vectors in the ecosystem.