CVE-2025-38682 (GCVE-0-2025-38682)
Vulnerability from cvelistv5
Published
2025-09-04 15:32
Modified
2025-09-04 15:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: core: Fix double-free of fwnode in i2c_unregister_device() Before commit df6d7277e552 ("i2c: core: Do not dereference fwnode in struct device"), i2c_unregister_device() only called fwnode_handle_put() on of_node-s in the form of calling of_node_put(client->dev.of_node). But after this commit the i2c_client's fwnode now unconditionally gets fwnode_handle_put() on it. When the i2c_client has no primary (ACPI / OF) fwnode but it does have a software fwnode, the software-node will be the primary node and fwnode_handle_put() will put() it. But for the software fwnode device_remove_software_node() will also put() it leading to a double free: [ 82.665598] ------------[ cut here ]------------ [ 82.665609] refcount_t: underflow; use-after-free. [ 82.665808] WARNING: CPU: 3 PID: 1502 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x11 ... [ 82.666830] RIP: 0010:refcount_warn_saturate+0xba/0x110 ... [ 82.666962] <TASK> [ 82.666971] i2c_unregister_device+0x60/0x90 Fix this by not calling fwnode_handle_put() when the primary fwnode is a software-node.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffe02f7c4e36090154646612e67d331832f92037
Impacted products
Vendor Product Version
Linux Linux Version: df6d7277e5525d6cce63127dd93ebec4c6354fa0
Version: df6d7277e5525d6cce63127dd93ebec4c6354fa0
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   Linux Linux Version: 6.16
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/i2c/i2c-core-base.c"
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              "version": "6.16.2",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc1",
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            }
          ]
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.2",
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                  "vulnerable": true
                },
                {
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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\ni2c: core: Fix double-free of fwnode in i2c_unregister_device()\n\nBefore commit df6d7277e552 (\"i2c: core: Do not dereference fwnode in struct\ndevice\"), i2c_unregister_device() only called fwnode_handle_put() on\nof_node-s in the form of calling of_node_put(client-\u003edev.of_node).\n\nBut after this commit the i2c_client\u0027s fwnode now unconditionally gets\nfwnode_handle_put() on it.\n\nWhen the i2c_client has no primary (ACPI / OF) fwnode but it does have\na software fwnode, the software-node will be the primary node and\nfwnode_handle_put() will put() it.\n\nBut for the software fwnode device_remove_software_node() will also put()\nit leading to a double free:\n\n[   82.665598] ------------[ cut here ]------------\n[   82.665609] refcount_t: underflow; use-after-free.\n[   82.665808] WARNING: CPU: 3 PID: 1502 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x11\n...\n[   82.666830] RIP: 0010:refcount_warn_saturate+0xba/0x110\n...\n[   82.666962]  \u003cTASK\u003e\n[   82.666971]  i2c_unregister_device+0x60/0x90\n\nFix this by not calling fwnode_handle_put() when the primary fwnode is\na software-node."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-04T15:32:37.403Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ffe02f7c4e36090154646612e67d331832f92037"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2"
        }
      ],
      "title": "i2c: core: Fix double-free of fwnode in i2c_unregister_device()",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38682",
    "datePublished": "2025-09-04T15:32:37.403Z",
    "dateReserved": "2025-04-16T04:51:24.031Z",
    "dateUpdated": "2025-09-04T15:32:37.403Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38682\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:35.910\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ni2c: core: Fix double-free of fwnode in i2c_unregister_device()\\n\\nBefore commit df6d7277e552 (\\\"i2c: core: Do not dereference fwnode in struct\\ndevice\\\"), i2c_unregister_device() only called fwnode_handle_put() on\\nof_node-s in the form of calling of_node_put(client-\u003edev.of_node).\\n\\nBut after this commit the i2c_client\u0027s fwnode now unconditionally gets\\nfwnode_handle_put() on it.\\n\\nWhen the i2c_client has no primary (ACPI / OF) fwnode but it does have\\na software fwnode, the software-node will be the primary node and\\nfwnode_handle_put() will put() it.\\n\\nBut for the software fwnode device_remove_software_node() will also put()\\nit leading to a double free:\\n\\n[   82.665598] ------------[ cut here ]------------\\n[   82.665609] refcount_t: underflow; use-after-free.\\n[   82.665808] WARNING: CPU: 3 PID: 1502 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x11\\n...\\n[   82.666830] RIP: 0010:refcount_warn_saturate+0xba/0x110\\n...\\n[   82.666962]  \u003cTASK\u003e\\n[   82.666971]  i2c_unregister_device+0x60/0x90\\n\\nFix this by not calling fwnode_handle_put() when the primary fwnode is\\na software-node.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ffe02f7c4e36090154646612e67d331832f92037\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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