CVE-2025-21810 (GCVE-0-2025-21810)

Vulnerability from cvelistv5 – Published: 2025-02-27 20:01 – Updated: 2025-05-04 07:21
VLAI?
Title
driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()
Summary
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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7b884b7f24b42fa25e92ed724ad82f137610afaf , < f4b9bc823b0cfdebfed479c0e87d6939c7562e87 (git)
Affected: 7b884b7f24b42fa25e92ed724ad82f137610afaf , < 1614e75d1a1b63db6421c7a4bf37004720c7376c (git)
Affected: 7b884b7f24b42fa25e92ed724ad82f137610afaf , < 5c504e9767b947cf7d4e29b811c0c8b3c53242b7 (git)
Affected: 7b884b7f24b42fa25e92ed724ad82f137610afaf , < e128f82f7006991c99a58114f70ef61e937b1ac1 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.76 , ≤ 6.6.* (semver)
Unaffected: 6.12.13 , ≤ 6.12.* (semver)
Unaffected: 6.13.2 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/base/class.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:21:40.730Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87"
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          "url": "https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c"
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          "url": "https://git.kernel.org/stable/c/5c504e9767b947cf7d4e29b811c0c8b3c53242b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/e128f82f7006991c99a58114f70ef61e937b1ac1"
        }
      ],
      "title": "driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21810",
    "datePublished": "2025-02-27T20:01:01.630Z",
    "dateReserved": "2024-12-29T08:45:45.772Z",
    "dateUpdated": "2025-05-04T07:21:40.730Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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