{"id":"CVE-2025-68758","title":"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 sup…","summary":"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 sup…","severity":"none","published":"2026-01-05","updated":"2026-10-14","sourceUpdated":"2026-10-14T19:10:00.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-68758","references":[{"url":"https://git.kernel.org/stable/c/08c9dc6b0f2c68e5e7c374ac4499e321e435d46c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0e63ea4378489e09eb5e920c8a50c10caacf563a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/30cbe4b642745a9488a0f0d78be43afe69d7555c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/64739adf3eef063b8e2c72b7e919eac8c6480bf0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cd01a24b3e52d6777b49c917d841f125fe9eebd0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00198,"epssPercentile":0.08929,"ingestedAt":"2026-10-14T19:49:57.551Z","slug":"CVE-2025-68758","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}