CVE-2026-43005: Linux内核hwmon驱动越界读取漏洞

/* * PoC Concept for CVE-2026-43005 * This demonstrates the vulnerable logic in tps53679_identify_chip. */ #include <stdio.h> #include <string.h> // Simulating the vulnerable behavior int vulnerable_function(int ret, unsigned char *buf) { // Original vulnerable check: only checks if ret < 0 if (ret < 0) { printf("Error: ret is negative\n"); return -1; } // If ret is 0, this accesses buf[-1], which is an out-of-bounds read printf("Attempting to read buf[%d]...\n", ret - 1); unsigned char val = buf[ret - 1]; printf("Read value: 0x%02x\n", val); return 0; } int main() { unsigned char buffer[10] = {0}; // Scenario: i2c_smbus_read_block_data returns 0 (zero-length read) // This triggers the out-of-bounds access on the stack printf("Triggering vulnerability with ret=0\n"); vulnerable_function(0, buffer); return 0; }