CVE-2026-31690 Linux内核缓冲区溢出漏洞

/* * Conceptual PoC for CVE-2026-31690 * This is a simulation of the vulnerable logic based on the description. * Triggering this requires specific hardware (TH1520) and interaction with the firmware driver. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulating the vulnerable structure interaction struct aon_rpc_data { char data[2]; // Small buffer intended for specific use }; void vulnerable_function(struct aon_rpc_data *resource, int offset) { // Vulnerability: unsafe pointer arithmetic accessing 'mode' // If offset is large enough, this writes past 'data' unsigned int *mode = (unsigned int *)((char *)resource->data + offset); printf("Writing to address: %p\n", mode); *mode = 0xDEADBEEF; // Potential buffer overflow } int main() { struct aon_rpc_data *res = malloc(sizeof(struct aon_rpc_data)); memset(res, 0, sizeof(struct aon_rpc_data)); // Malicious input triggering the overflow (offset > sizeof(data)) // The Smatch warning was "buffer overflow 'data' 2 <= 3" printf("Attempting to trigger overflow...\n"); vulnerable_function(res, 3); free(res); return 0; }