CVE-2026-23408 Linux内核AppArmor双重释放漏洞

/* * PoC Concept for CVE-2026-23408 * This is a conceptual demonstration of the logic flow. * Exploiting this requires specific kernel memory layout manipulation. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> // Mock structures to represent the kernel logic interaction // In a real scenario, this interacts with AppArmor netlink interface. struct aa_load_ent { char *ns_name; // other fields... }; void trigger_vulnerability_concept() { printf("[+] Attempting to trigger AppArmor double free...\n"); // 1. Prepare data where unpack returns NULL for ns_name initially // 2. Ensure ent->ns_name is set to a valid heap pointer struct aa_load_ent *ent = malloc(sizeof(struct aa_load_ent)); ent->ns_name = strdup("target_namespace"); char *ns_name = NULL; // Simulation of kernel code path: // error = aa_unpack(udata, &lh, &ns_name); // Assume ns_name remains NULL if (ns_name == NULL && ent->ns_name) { ns_name = ent->ns_name; // VULNERABILITY: Missing ent->ns_name = NULL; printf("[+] ns_name assigned from ent->ns_name: %p\n", ns_name); } // Simulation of aa_load_ent_free(ent) printf("[-] Freeing ent (frees ent->ns_name at %p)\n", ent->ns_name); free(ent->ns_name); free(ent); // Simulation of final kfree(ns_name) printf("[-] Freeing ns_name again (Double Free at %p)\n", ns_name); free(ns_name); // CRASH: Double Free printf("[!] If kernel panicked, exploitation successful.\n"); } int main() { // Note: Actual exploitation requires calling kernel syscalls/netlink // to reach aa_replace_profiles(). This code illustrates the C logic flaw. trigger_vulnerability_concept(); return 0; }