CVE-2026-31491 Linux内核RDMA/irdma深度计算整数溢出漏洞

// PoC Concept for CVE-2026-31491: Triggering Integer Overflow // This requires a compiled kernel module or specific user-space tool interacting with RDMA. #include <stdio.h> #include <stdint.h> // Simulating the vulnerable logic in the kernel int vulnerable_depth_check(uint32_t size) { // Vulnerable calculation using u32 uint32_t depth = size * 2; // If size is U32_MAX, this overflows to a small number printf("Input size: %u, Calculated depth: %u\n", size, depth); if (depth > 1000) { // Arbitrary limit check return -1; // Fail } return 0; // Success } int main() { uint32_t max_size = 0xFFFFFFFF; // U32_MAX printf("Attempting to trigger vulnerability...\n"); if (vulnerable_depth_check(max_size) == 0) { printf("[!] Vulnerability Triggered: Check passed with U32_MAX input.\n"); } else { printf("[+] Check failed correctly.\n"); } return 0; }