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().
Metrics
Affected Vendors & Products
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References
History
Wed, 02 Apr 2025 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-20 |
Fri, 28 Feb 2025 14:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
| |
| Metrics |
threat_severity
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cvssV3_1
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Thu, 27 Feb 2025 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 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(). | |
| Title | driver core: class: Fix wild pointer dereferences in API class_dev_iter_next() | |
| References |
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2025-02-27T20:01:01.630Z
Updated: 2025-05-04T07:21:40.730Z
Reserved: 2024-12-29T08:45:45.772Z
Link: CVE-2025-21810
Vulnrichment
No data.
NVD
Status : Received
Published: 2025-02-27T20:16:03.587
Modified: 2025-02-27T20:16:03.587
Link: CVE-2025-21810
Redhat