CVE-2025-68758
Estado: AplazadaSin puntuar—
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:
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.
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On removal of the above overlay, the LED driver can be removed before the backlight device, resulting in:
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):
Fix by adding a devlink between the consuming led-backlight device and the supplying LED device, as other drivers and subsystems do as well.
Detalles técnicos trazas, registros y código del informe original
// 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>;
};
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
...
Call trace:
led_put+0xe0/0x140
devm_led_release+0x6c/0x98
echo 11-0062 >/sys/bus/i2c/drivers/leds-pca963x/unbind
echo ...backlight-dock >/sys/bus/platform/drivers/led-backlight/unbindCVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/08c9dc6b0f2c68e5e7c374ac4499e321e435d46c
- https://git.kernel.org/stable/c/0e63ea4378489e09eb5e920c8a50c10caacf563a
- https://git.kernel.org/stable/c/30cbe4b642745a9488a0f0d78be43afe69d7555c
- https://git.kernel.org/stable/c/60a24070392ec726ccfe6ad1ca7b0381c8d8f7c9
- https://git.kernel.org/stable/c/64739adf3eef063b8e2c72b7e919eac8c6480bf0
- https://git.kernel.org/stable/c/9341d6698f4cfdfc374fb6944158d111ebe16a9d
- https://git.kernel.org/stable/c/cd01a24b3e52d6777b49c917d841f125fe9eebd0
- https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-68758",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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{
"status": "unaffected",
"version": "5.10.248",
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{
"status": "unaffected",
"version": "5.15.198",
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{
"status": "unaffected",
"version": "6.1.160",
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{
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"version": "6.6.120",
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{
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{
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]
}
],
"published": "2026-01-05T10:15:56.897",
"references": [
{
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{
"url": "https://git.kernel.org/stable/c/e06df738a9ad8417f1c4c7cd6992cda320e9e7ca",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"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 = <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."
}
],
"lastModified": "2026-06-17T09:59:32.360",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}