CVE-2026-23315: Linux内核mt76驱动越界访问漏洞

#include <stdio.h> #include <string.h> // Simulated PoC for the OOB access vulnerability in mt76 driver // This demonstrates the logic flaw: accessing struct fields without length check. struct ieee80211_mgmt { unsigned short frame_control; unsigned short duration; unsigned char da[6]; unsigned char sa[6]; unsigned char bssid[6]; unsigned short seq_ctrl; unsigned char variable[0]; // Flexible array member representing payload } __attribute__((packed)); // Vulnerable function simulation void simulate_vulnerable_write_txwi(unsigned char *data, int len) { struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)data; printf("Processing frame of length: %d\n", len); // The vulnerability occurs here. The code assumes the frame is long enough // to contain action details without checking 'len' first. // In the actual vuln, it accesses mgmt->u.action.u.addba_req.capab if (len < sizeof(struct ieee80211_mgmt)) { printf("Frame too short for basic header.\n"); return; } // VULNERABLE ACCESS: Accessing offset beyond provided length // This simulates accessing mgmt->u.action.u.addba_req.capab unsigned short *capab_ptr = (unsigned short *)(mgmt->variable + 10); printf("Attempting to read capability field at offset...\n"); // This read is Out-Of-Bounds if len is too small unsigned short capab = *capab_ptr; printf("Read value: 0x%x (This could be garbage or crash)\n", capab); } int main() { // Malicious packet: Header exists, but action frame payload is truncated unsigned char malicious_packet[64]; memset(malicious_packet, 0x90, 64); // Set a length that passes basic checks but fails deep structure access int packet_len = 30; printf("Simulating CVE-2026-23315 Trigger...\n"); simulate_vulnerable_write_txwi(malicious_packet, packet_len); return 0; }