CVE-2026-43250: Linux内核USB驱动DMA清理漏洞

/* * PoC Concept for CVE-2026-43250 * This module simulates a scenario to trigger the DMA cleanup bug. * Requires a system with ChipIdea UDC hardware. */ #include <linux/module.h> #include <linux/usb/gadget.h> static int __init poc_init(void) { // 1. Initialize a USB gadget driver // 2. Queue a multi-segment DMA request (SG list) // 3. Simulate a disconnect event (trigger _ep_nuke) // while transfer is active. // 4. Reconnect and attempt to reuse the same request // structure without re-initialization. // // Result: The kernel tries to use the stale DMA address // from the previous transfer, leading to a crash. printk(KERN_INFO "CVE-2026-43250 PoC: Triggering stale DMA reuse...\n"); // Actual hardware interaction code would go here return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "CVE-2026-43250 PoC: Exiting.\n"); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");