CVE-2025-21810
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, the class_dev_iter_next() API has a wild pointer dereference issue. class_dev_iter_init() does not initialize the iterator on error, and subsequent calls to class_dev_iter_next() and class_dev_iter_exit() may dereference uninitialized pointers, causing a crash.
Risk Assessment
This vulnerability can cause a system crash (DoS) when iterating over device classes if the iterator initialization fails.
Recommendation
Apply the patch that initializes the iterator via memset() in class_dev_iter_init() and adds validity checks in class_dev_iter_next().
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Original NVD description (English source)
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 by: - Initialize output parameter @iter by memset() in class_dev_iter_init() and give callers prompt by pr_crit() for the error. - Check if @iter is valid in class_dev_iter_next().