CVE-2025-68758 (GCVE-0-2025-68758)

Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-01-11 16:30
VLAI?
Title
backlight: led-bl: Add devlink to supplier LEDs
Summary
In the Linux kernel, the following vulnerability has been resolved: backlight: led-bl: Add devlink to supplier LEDs LED Backlight is a consumer of one or multiple LED class devices, but devlink is currently unable to create correct supplier-producer links when the supplier is a class device. It creates instead a link where the supplier is the parent of the expected device. One consequence is that removal order is not correctly enforced. Issues happen for example with the following sections in a device tree overlay: // An LED driver chip pca9632@62 { compatible = "nxp,pca9632"; reg = <0x62>; // ... addon_led_pwm: led-pwm@3 { reg = <3>; label = "addon:led:pwm"; }; }; backlight-addon { compatible = "led-backlight"; leds = <&addon_led_pwm>; brightness-levels = <255>; default-brightness-level = <255>; }; In this example, the devlink should be created between the backlight-addon (consumer) and the pca9632@62 (supplier). Instead it is created between the backlight-addon (consumer) and the parent of the pca9632@62, which is typically the I2C bus adapter. On removal of the above overlay, the LED driver can be removed before the backlight device, resulting in: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 ... Call trace: led_put+0xe0/0x140 devm_led_release+0x6c/0x98 Another way to reproduce the bug without any device tree overlays is unbinding the LED class device (pca9632@62) before unbinding the consumer (backlight-addon): echo 11-0062 >/sys/bus/i2c/drivers/leds-pca963x/unbind echo ...backlight-dock >/sys/bus/platform/drivers/led-backlight/unbind Fix by adding a devlink between the consuming led-backlight device and the supplying LED device, as other drivers and subsystems do as well.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < e06df738a9ad8417f1c4c7cd6992cda320e9e7ca (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 30cbe4b642745a9488a0f0d78be43afe69d7555c (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 0e63ea4378489e09eb5e920c8a50c10caacf563a (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9 (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 08c9dc6b0f2c68e5e7c374ac4499e321e435d46c (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 9341d6698f4cfdfc374fb6944158d111ebe16a9d (git)
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    Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/backlight/led_bl.c"
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              "status": "unaffected",
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              "status": "unaffected",
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              "version": "6.18.2",
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              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
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          ]
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      ],
      "cpeApplicability": [
        {
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbacklight: led-bl: Add devlink to supplier LEDs\n\nLED Backlight is a consumer of one or multiple LED class devices, but\ndevlink is currently unable to create correct supplier-producer links when\nthe supplier is a class device. It creates instead a link where the\nsupplier is the parent of the expected device.\n\nOne consequence is that removal order is not correctly enforced.\n\nIssues happen for example with the following sections in a device tree\noverlay:\n\n    // An LED driver chip\n    pca9632@62 {\n        compatible = \"nxp,pca9632\";\n        reg = \u003c0x62\u003e;\n\n\t// ...\n\n        addon_led_pwm: led-pwm@3 {\n            reg = \u003c3\u003e;\n            label = \"addon:led:pwm\";\n        };\n    };\n\n    backlight-addon {\n        compatible = \"led-backlight\";\n        leds = \u003c\u0026addon_led_pwm\u003e;\n        brightness-levels = \u003c255\u003e;\n        default-brightness-level = \u003c255\u003e;\n    };\n\nIn this example, the devlink should be created between the backlight-addon\n(consumer) and the pca9632@62 (supplier). Instead it is created between the\nbacklight-addon (consumer) and the parent of the pca9632@62, which is\ntypically the I2C bus adapter.\n\nOn removal of the above overlay, the LED driver can be removed before the\nbacklight device, resulting in:\n\n    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n    ...\n    Call trace:\n     led_put+0xe0/0x140\n     devm_led_release+0x6c/0x98\n\nAnother way to reproduce the bug without any device tree overlays is\nunbinding the LED class device (pca9632@62) before unbinding the consumer\n(backlight-addon):\n\n  echo 11-0062 \u003e/sys/bus/i2c/drivers/leds-pca963x/unbind\n  echo ...backlight-dock \u003e/sys/bus/platform/drivers/led-backlight/unbind\n\nFix by adding a devlink between the consuming led-backlight device and the\nsupplying LED device, as other drivers and subsystems do as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-11T16:30:29.409Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d"
        }
      ],
      "title": "backlight: led-bl: Add devlink to supplier LEDs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68758",
    "datePublished": "2026-01-05T09:32:31.399Z",
    "dateReserved": "2025-12-24T10:30:51.033Z",
    "dateUpdated": "2026-01-11T16:30:29.409Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68758\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-05T10:15:56.897\",\"lastModified\":\"2026-01-11T17:15:58.453\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbacklight: led-bl: Add devlink to supplier LEDs\\n\\nLED Backlight is a consumer of one or multiple LED class devices, but\\ndevlink is currently unable to create correct supplier-producer links when\\nthe supplier is a class device. It creates instead a link where the\\nsupplier is the parent of the expected device.\\n\\nOne consequence is that removal order is not correctly enforced.\\n\\nIssues happen for example with the following sections in a device tree\\noverlay:\\n\\n    // An LED driver chip\\n    pca9632@62 {\\n        compatible = \\\"nxp,pca9632\\\";\\n        reg = \u003c0x62\u003e;\\n\\n\\t// ...\\n\\n        addon_led_pwm: led-pwm@3 {\\n            reg = \u003c3\u003e;\\n            label = \\\"addon:led:pwm\\\";\\n        };\\n    };\\n\\n    backlight-addon {\\n        compatible = \\\"led-backlight\\\";\\n        leds = \u003c\u0026addon_led_pwm\u003e;\\n        brightness-levels = \u003c255\u003e;\\n        default-brightness-level = \u003c255\u003e;\\n    };\\n\\nIn this example, the devlink should be created between the backlight-addon\\n(consumer) and the pca9632@62 (supplier). Instead it is created between the\\nbacklight-addon (consumer) and the parent of the pca9632@62, which is\\ntypically the I2C bus adapter.\\n\\nOn removal of the above overlay, the LED driver can be removed before the\\nbacklight device, resulting in:\\n\\n    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\\n    ...\\n    Call trace:\\n     led_put+0xe0/0x140\\n     devm_led_release+0x6c/0x98\\n\\nAnother way to reproduce the bug without any device tree overlays is\\nunbinding the LED class device (pca9632@62) before unbinding the consumer\\n(backlight-addon):\\n\\n  echo 11-0062 \u003e/sys/bus/i2c/drivers/leds-pca963x/unbind\\n  echo ...backlight-dock \u003e/sys/bus/platform/drivers/led-backlight/unbind\\n\\nFix by adding a devlink between the consuming led-backlight device and the\\nsupplying LED device, as other drivers and subsystems do as well.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08c9dc6b0f2c68e5e7c374ac4499e321e435d46c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0e63ea4378489e09eb5e920c8a50c10caacf563a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30cbe4b642745a9488a0f0d78be43afe69d7555c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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