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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
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)
guessed Create a notification for this product.
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{
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                  "vulnerable": true
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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": "2026-05-11T21:52:46.981Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/64739adf3eef063b8e2c72b7e919eac8c6480bf0"
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          "url": "https://git.kernel.org/stable/c/cd01a24b3e52d6777b49c917d841f125fe9eebd0"
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        },
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          "url": "https://git.kernel.org/stable/c/60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9"
        },
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          "url": "https://git.kernel.org/stable/c/08c9dc6b0f2c68e5e7c374ac4499e321e435d46c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d"
        }
      ],
      "title": "backlight: led-bl: Add devlink to supplier LEDs",
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      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68758",
    "datePublished": "2026-01-05T09:32:31.399Z",
    "dateReserved": "2025-12-24T10:30:51.033Z",
    "dateUpdated": "2026-05-11T21:52:46.981Z",
    "state": "PUBLISHED"
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      "date": "2026-09-17",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68758\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-05T10:15:56.897\",\"lastModified\":\"2026-06-17T09:59:32.360\",\"vulnStatus\":\"Deferred\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/video/backlight/led_bl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"64739adf3eef063b8e2c72b7e919eac8c6480bf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"cd01a24b3e52d6777b49c917d841f125fe9eebd0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"e06df738a9ad8417f1c4c7cd6992cda320e9e7ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"30cbe4b642745a9488a0f0d78be43afe69d7555c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"0e63ea4378489e09eb5e920c8a50c10caacf563a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"08c9dc6b0f2c68e5e7c374ac4499e321e435d46c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae232e45acf9621f2c96b41ca3af006ac7552c33\",\"lessThan\":\"9341d6698f4cfdfc374fb6944158d111ebe16a9d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/video/backlight/led_bl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.63\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.13\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.2\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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/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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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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