ghsa-p7wm-885p-3rmg
Vulnerability from github
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().
{
"affected": [],
"aliases": [
"CVE-2025-21810"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-27T20:16:03Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: class: Fix wild pointer dereferences in API class_dev_iter_next()\n\nThere are a potential wild pointer dereferences issue regarding APIs\nclass_dev_iter_(init|next|exit)(), as explained by below typical usage:\n\n// All members of @iter are wild pointers.\nstruct class_dev_iter iter;\n\n// class_dev_iter_init(@iter, @class, ...) checks parameter @class for\n// potential class_to_subsys() error, and it returns void type and does\n// not initialize its output parameter @iter, so caller can not detect\n// the error and continues to invoke class_dev_iter_next(@iter) even if\n// @iter still contains wild pointers.\nclass_dev_iter_init(\u0026iter, ...);\n\n// Dereference these wild pointers in @iter here once suffer the error.\nwhile (dev = class_dev_iter_next(\u0026iter)) { ... };\n\n// Also dereference these wild pointers here.\nclass_dev_iter_exit(\u0026iter);\n\nActually, all callers of these APIs have such usage pattern in kernel tree.\nFix by:\n- Initialize output parameter @iter by memset() in class_dev_iter_init()\n and give callers prompt by pr_crit() for the error.\n- Check if @iter is valid in class_dev_iter_next().",
"id": "GHSA-p7wm-885p-3rmg",
"modified": "2025-02-27T21:32:17Z",
"published": "2025-02-27T21:32:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21810"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c504e9767b947cf7d4e29b811c0c8b3c53242b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e128f82f7006991c99a58114f70ef61e937b1ac1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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