CVE-2025-21810

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()

There are a potential wild pointer dereferences issue regarding APIs

class_dev_iter_(init|next|exit)(), as explained by below typical usage:

// All members of @iter are wild pointers.

struct class_dev_iter iter;

// class_dev_iter_init(@iter, @class, ...) checks parameter @class for

// potential class_to_subsys() error, and it returns void type and does

// not initialize its output parameter @iter, so caller can not detect

// the error and continues to invoke class_dev_iter_next(@iter) even if

// @iter still contains wild pointers.

class_dev_iter_init(&iter, ...);

// Dereference these wild pointers in @iter here once suffer the error.

while (dev = class_dev_iter_next(&iter)) { ... };

// Also dereference these wild pointers here.

class_dev_iter_exit(&iter);

Actually, all callers of these APIs have such usage pattern in kernel tree.

Fix

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References