{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68758",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68758"
  ],
  "published": "2026-01-05T09:32:59Z",
  "summary": "backlight: led-bl: Add devlink to supplier LEDs",
  "details": "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 = <0x62>;\n\n\t// ...\n\n        addon_led_pwm: led-pwm@3 {\n            reg = <3>;\n            label = \"addon:led:pwm\";\n        };\n    };\n\n    backlight-addon {\n        compatible = \"led-backlight\";\n        leds = <&addon_led_pwm>;\n        brightness-levels = <255>;\n        default-brightness-level = <255>;\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 >/sys/bus/i2c/drivers/leds-pca963x/unbind\n  echo ...backlight-dock >/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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.160",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68758"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64739adf3eef063b8e2c72b7e919eac8c6480bf0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cd01a24b3e52d6777b49c917d841f125fe9eebd0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/30cbe4b642745a9488a0f0d78be43afe69d7555c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e63ea4378489e09eb5e920c8a50c10caacf563a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/08c9dc6b0f2c68e5e7c374ac4499e321e435d46c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}