CVE-2026-23403 Linux内核AppArmor内存泄漏漏洞

/* * PoC for CVE-2026-23403: AppArmor Memory Leak * This PoC attempts to trigger the memory leak by repeatedly * unpacking profiles. Note: This requires a vulnerable kernel * and appropriate privileges to load AppArmor profiles. */ #include <stdio.h> #include <stdlib.h> // Pseudo-code to demonstrate the loop causing the leak in verify_header int main() { printf("Attempting to trigger CVE-2026-23403...\n"); printf("Loading profiles to exhaust memory via verify_header leak.\n"); for (int i = 0; i < 10000; i++) { // In a real exploit scenario, replace this with the actual syscall // or command to load a profile with a namespace defined. // system("apparmor_parser -r profile_with_namespace"); // Simulating the trigger alloc_and_leak_namespace(); } return 0; } void alloc_and_leak_namespace() { // Simulation of the kernel logic where *ns is set to NULL // causing the previously allocated memory to leak. char *ns = malloc(1024); ns = NULL; // The bug: overwriting the pointer without freeing }