CVE-2026-43433 Linux内核rust_binder权限提升漏洞

// Conceptual PoC: Demonstrating the race condition scenario. // Note: Exploitation requires a separate vulnerability to write to read-only VMA. #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated Binder Transaction Structure struct binder_transaction_data { void *target_handle; void *cookie; size_t data_size; size_t offsets_size; // The field of interest // ... other fields ... }; void trigger_race() { printf("[+] Attempting to trigger TOCTOU in rust_binder...\n"); // Step 1: Attacker prepares a transaction with a specific payload shape struct binder_transaction_data txn; txn.offsets_size = 0x100; // Initial offset size // Step 2: Kernel copies offsets to target VMA (Read-Only) printf("[*] Kernel copying offsets to Target VMA...\n"); // Step 3: Hypothetical race window where Target Process modifies VMA // (Requires another vulnerability to write to RO VMA) printf("[*] Race Window: If Target Process can write VMA, it changes offsets_size...\n"); // txn.offsets_size = 0xFFFFFFFF; // Malicious value modification // Step 4: Kernel reads back the value from VMA printf("[*] Kernel reading back offsets from VMA...\n"); // Result: Kernel misinterprets memory layout, leading to potential escalation printf("[-] Exploitation logic complete (depends on VMA write capability).\n"); } int main() { trigger_race(); return 0; }