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

Vulnerability from cvelistv5 – Published: 2025-02-27 20:01 – Updated: 2026-05-11 21:06
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/class.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f4b9bc823b0cfdebfed479c0e87d6939c7562e87",
              "status": "affected",
              "version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
              "versionType": "git"
            },
            {
              "lessThan": "1614e75d1a1b63db6421c7a4bf37004720c7376c",
              "status": "affected",
              "version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
              "versionType": "git"
            },
            {
              "lessThan": "5c504e9767b947cf7d4e29b811c0c8b3c53242b7",
              "status": "affected",
              "version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
              "versionType": "git"
            },
            {
              "lessThan": "e128f82f7006991c99a58114f70ef61e937b1ac1",
              "status": "affected",
              "version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/class.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.76",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.76",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.13",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.2",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-11T21:06:58.314Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87"
        },
        {
          "url": "https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c"
        },
        {
          "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()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21810",
    "datePublished": "2025-02-27T20:01:01.630Z",
    "dateReserved": "2024-12-29T08:45:45.772Z",
    "dateUpdated": "2026-05-11T21:06:58.314Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-21810",
      "date": "2026-07-23",
      "epss": "0.0018",
      "percentile": "0.0778"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21810\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T20:16:03.587\",\"lastModified\":\"2026-06-17T08:44:19.953\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: n\u00facleo del controlador: clase: Arreglar desreferencias de punteros salvajes en la API class_dev_iter_next() Hay un posible problema de desreferencias de punteros salvajes con respecto a las API class_dev_iter_(init|next|exit()), como se explica a continuaci\u00f3n en el uso t\u00edpico: // Todos los miembros de @iter son punteros salvajes. struct class_dev_iter iter; // class_dev_iter_init(@iter, @class, ...) comprueba el par\u00e1metro @class en busca de un posible error class_to_subsys(), y devuelve el tipo void y no inicializa su par\u00e1metro de salida @iter, por lo que el llamador no puede detectar el error y contin\u00faa invocando class_dev_iter_next(@iter) incluso si @iter todav\u00eda contiene punteros salvajes. class_dev_iter_init(\u0026amp;iter, ...); // Desreferencia estos punteros salvajes en @iter aqu\u00ed una vez que sufre el error. mientras (dev = class_dev_iter_next(\u0026amp;iter)) { ... }; // Tambi\u00e9n desreferencia estos punteros salvajes aqu\u00ed. class_dev_iter_exit(\u0026amp;iter); En realidad, todos los que llaman a estas API tienen ese patr\u00f3n de uso en el \u00e1rbol del kernel. Solucione esto: - Inicialice el par\u00e1metro de salida @iter con memset() en class_dev_iter_init() y d\u00e9 a los que llaman un aviso con pr_crit() para el error. - Verifique si @iter es v\u00e1lido en class_dev_iter_next().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/base/class.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7b884b7f24b42fa25e92ed724ad82f137610afaf\",\"lessThan\":\"f4b9bc823b0cfdebfed479c0e87d6939c7562e87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b884b7f24b42fa25e92ed724ad82f137610afaf\",\"lessThan\":\"1614e75d1a1b63db6421c7a4bf37004720c7376c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b884b7f24b42fa25e92ed724ad82f137610afaf\",\"lessThan\":\"5c504e9767b947cf7d4e29b811c0c8b3c53242b7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b884b7f24b42fa25e92ed724ad82f137610afaf\",\"lessThan\":\"e128f82f7006991c99a58114f70ef61e937b1ac1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/base/class.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.76\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.13\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.2\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.4\",\"versionEndExcluding\":\"6.6.76\",\"matchCriteriaId\":\"C6A28F1A-2CCA-4B18-AA73-20D184A7D477\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.13\",\"matchCriteriaId\":\"2897389C-A8C3-4D69-90F2-E701B3D66373\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.2\",\"matchCriteriaId\":\"6D4116B1-1BFD-4F23-BA84-169CC05FC5A3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c504e9767b947cf7d4e29b811c0c8b3c53242b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e128f82f7006991c99a58114f70ef61e937b1ac1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:17:59+00:00",
      "cve": "CVE-2025-21810",
      "id": "CVE-2025-21810",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_affected": "226",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21810.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.