CVE-2026-31535 Linux内核SMB客户端竞态漏洞

/* * PoC Concept for CVE-2026-31535 * This is a conceptual demonstration of the race condition. * Exploiting this requires triggering SMB Direct traffic rapidly. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> // Simulated credit counter logic (Vulnerable) struct vulnerable_credits { int posted_recv; int granted; }; // Simulated credit counter logic (Fixed) struct fixed_credits { int available; }; void simulate_race() { printf("[+] Simulating Race Condition in SMB Direct Credit Management\n"); // In a real scenario, threads would be manipulating these counters // while hardware interrupts signal packet reception. printf("[+] Step 1: Peer consumes credit.\n"); printf("[+] Step 2: Hardware receives packet, waits for 'recv_done'.\n"); printf("[+] Step 3: Vulnerable logic grants credit based on stale posted_recv count.\n"); printf("[+] Result: Credit inflation -> Resource Exhaustion/DoS.\n"); } int main() { simulate_race(); return 0; }