CVE-2026-23433: Linux内核arm_mpam空指针解引用漏洞

/* * PoC Simulation for CVE-2026-23433 * This C code simulates the Null Pointer Dereference logic found in * the Linux kernel mpam_restore_mbwu_state function. * * Vulnerability Logic: * The function fails to initialize a pointer before passing it to a helper * function that attempts to write to it. */ #include <stdio.h> #include <stdlib.h> // Simulating the argument structure struct mbwu_arg { long *val; // Pointer that should be initialized but isn't }; // Simulating the __ris_msmon_read function behavior void simulated_read_func(struct mbwu_arg *arg) { printf("[Kernel] Attempting to read and update value...\n"); // The vulnerable line: dereferencing arg->val which is NULL *(arg->val) += 0x10; printf("[Kernel] Value updated.\n"); } // Simulating mpam_restore_mbwu_state void vulnerable_restore_state() { struct mbwu_arg args; // Vulnerability: args.val is not initialized (remains NULL) args.val = NULL; printf("[Vuln] Restoring MBWU state with uninitialized pointer...\n"); simulated_read_func(&args); } int main() { printf("PoC for CVE-2026-23433: Triggering Null Pointer Dereference\n"); vulnerable_restore_state(); return 0; }