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

Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-05-11 21:52
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < 64739adf3eef063b8e2c72b7e919eac8c6480bf0 (git)
Affected: ae232e45acf9621f2c96b41ca3af006ac7552c33 , < cd01a24b3e52d6777b49c917d841f125fe9eebd0 (git)
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: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (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 , ≤ * (original_commit_for_fix)
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{
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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."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d"
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      "title": "backlight: led-bl: Add devlink to supplier LEDs",
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    "dateReserved": "2025-12-24T10:30:51.033Z",
    "dateUpdated": "2026-05-11T21:52:46.981Z",
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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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbacklight: led-bl: A\u00f1adir devlink a los LED proveedores\n\nLa retroiluminaci\u00f3n LED es un consumidor de uno o m\u00faltiples dispositivos de clase LED, pero devlink es actualmente incapaz de crear enlaces correctos proveedor-productor cuando el proveedor es un dispositivo de clase. En su lugar, crea un enlace donde el proveedor es el padre del dispositivo esperado.\n\nUna consecuencia es que el orden de eliminaci\u00f3n no se aplica correctamente.\n\nLos problemas ocurren, por ejemplo, con las siguientes secciones en una superposici\u00f3n de \u00e1rbol de dispositivos:\n\n    // An LED driver chip\n    pca9632@62 {\n        compatible = \u201cnxp,pca9632\u201d;\n        reg = \u003c0x62\u003e;\n\n\t// ...\n\n        addon_led_pwm: led-pwm@3 {\n            reg = \u003c3\u003e;\n            label = \u201caddon:led:pwm\u201d;\n        };\n    };\n\n    backlight-addon {\n        compatible = \u201cled-backlight\u201d;\n        leds = \u003c\u0026addon_led_pwm\u003e;\n        brightness-levels = \u003c255\u003e;\n        default-brightness-level = \u003c255\u003e;\n    };\n\nEn este ejemplo, el devlink deber\u00eda crearse entre el backlight-addon (consumidor) y el pca9632@62 (proveedor). En su lugar, se crea entre el backlight-addon (consumidor) y el padre del pca9632@62, que es t\u00edpicamente el adaptador de bus I2C.\n\nAl eliminar la superposici\u00f3n anterior, el controlador LED puede eliminarse antes que el dispositivo de retroiluminaci\u00f3n, lo que resulta en:\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\nOtra forma de reproducir el error sin ninguna superposici\u00f3n de \u00e1rbol de dispositivos es desvincular el dispositivo de clase LED (pca9632@62) antes de desvincular el consumidor (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\nSoluci\u00f3n a\u00f1adiendo un devlink entre el dispositivo led-backlight consumidor y el dispositivo LED proveedor, como tambi\u00e9n lo hacen otros controladores y subsistemas."
          }
        ],
        "id": "CVE-2025-68758",
        "lastModified": "2026-10-14T19:10:00.297",
        "metrics": {},
        "published": "2026-01-05T10:15:56.897",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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/64739adf3eef063b8e2c72b7e919eac8c6480bf0"
          },
          {
            "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/cd01a24b3e52d6777b49c917d841f125fe9eebd0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:37:46+00:00",
      "cve": "CVE-2025-68758",
      "id": "CVE-2025-68758",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: backlight: led-bl: Add devlink to supplier LEDs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68758.json",
      "version": "3"
    }
  }
}



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