fkie_cve-2023-53166
Vulnerability from fkie_nvd
Published
2025-09-15 14:15
Modified
2025-11-24 21:02
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: bq25890: Fix external_power_changed race bq25890_charger_external_power_changed() dereferences bq->charger, which gets sets in bq25890_power_supply_init() like this: bq->charger = devm_power_supply_register(bq->dev, &bq->desc, &psy_cfg); As soon as devm_power_supply_register() has called device_add() the external_power_changed callback can get called. So there is a window where bq25890_charger_external_power_changed() may get called while bq->charger has not been set yet leading to a NULL pointer dereference. This race hits during boot sometimes on a Lenovo Yoga Book 1 yb1-x90f when the cht_wcove_pwrsrc (extcon) power_supply is done with detecting the connected charger-type which happens to exactly hit the small window: BUG: kernel NULL pointer dereference, address: 0000000000000018 <snip> RIP: 0010:__power_supply_is_supplied_by+0xb/0xb0 <snip> Call Trace: <TASK> __power_supply_get_supplier_property+0x19/0x50 class_for_each_device+0xb1/0xe0 power_supply_get_property_from_supplier+0x2e/0x50 bq25890_charger_external_power_changed+0x38/0x1b0 [bq25890_charger] __power_supply_changed_work+0x30/0x40 class_for_each_device+0xb1/0xe0 power_supply_changed_work+0x5f/0xe0 <snip> Fixing this is easy. The external_power_changed callback gets passed the power_supply which will eventually get stored in bq->charger, so bq25890_charger_external_power_changed() can simply directly use the passed in psy argument which is always valid.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/029a443b9b6424170f00f6dd5b7682e682cce92ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72c28207c19c2c46fab8ae994aff25e197fb2949Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d20fa1982c35697f3f8c4ae0f12791691ae5958Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.4
linux linux_kernel 6.4
linux linux_kernel 6.4


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: bq25890: Fix external_power_changed race\n\nbq25890_charger_external_power_changed() dereferences bq-\u003echarger,\nwhich gets sets in bq25890_power_supply_init() like this:\n\n  bq-\u003echarger = devm_power_supply_register(bq-\u003edev, \u0026bq-\u003edesc, \u0026psy_cfg);\n\nAs soon as devm_power_supply_register() has called device_add()\nthe external_power_changed callback can get called. So there is a window\nwhere bq25890_charger_external_power_changed() may get called while\nbq-\u003echarger has not been set yet leading to a NULL pointer dereference.\n\nThis race hits during boot sometimes on a Lenovo Yoga Book 1 yb1-x90f\nwhen the cht_wcove_pwrsrc (extcon) power_supply is done with detecting\nthe connected charger-type which happens to exactly hit the small window:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  \u003csnip\u003e\n  RIP: 0010:__power_supply_is_supplied_by+0xb/0xb0\n  \u003csnip\u003e\n  Call Trace:\n   \u003cTASK\u003e\n   __power_supply_get_supplier_property+0x19/0x50\n   class_for_each_device+0xb1/0xe0\n   power_supply_get_property_from_supplier+0x2e/0x50\n   bq25890_charger_external_power_changed+0x38/0x1b0 [bq25890_charger]\n   __power_supply_changed_work+0x30/0x40\n   class_for_each_device+0xb1/0xe0\n   power_supply_changed_work+0x5f/0xe0\n  \u003csnip\u003e\n\nFixing this is easy. The external_power_changed callback gets passed\nthe power_supply which will eventually get stored in bq-\u003echarger,\nso bq25890_charger_external_power_changed() can simply directly use\nthe passed in psy argument which is always valid."
    }
  ],
  "id": "CVE-2023-53166",
  "lastModified": "2025-11-24T21:02:32.000",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-15T14:15:38.343",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-362"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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