CVE-2026-23455 Linux内核netfilter越界读取漏洞

/* * PoC Concept for CVE-2026-23455 * This C code demonstrates the logic error in DecodeQ931. * It simulates the integer underflow when length is 0. */ #include <stdio.h> #include <stdint.h> // Simulated vulnerable function logic void vulnerable_decode_q931(uint16_t ie_len) { printf("[VULN] Initial IE Length: %u\n", ie_len); // The vulnerable operation: decrement without checking for 0 ie_len--; printf("[VULN] Length after decrement: %u\n", ie_len); if (ie_len > 1024) { printf("[EXPLOIT] Potential Out-of-Bounds Read detected! Length is too large.\n"); } } // Simulated patched function logic void patched_decode_q931(uint16_t ie_len) { printf("[PATCH] Initial IE Length: %u\n", ie_len); // Patch: Check for underflow before decrementing if (ie_len == 0) { printf("[PATCH] Invalid length 0, aborting.\n"); return; } ie_len--; printf("[PATCH] Length after decrement: %u\n", ie_len); } int main() { printf("--- Testing Vulnerable Logic ---\n"); // Malicious packet with length 0 vulnerable_decode_q931(0); printf("\n--- Testing Patched Logic ---\n"); patched_decode_q931(0); return 0; }