FKIE_CVE-2026-23101

Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-03-19 19:33
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: leds: led-class: Only Add LED to leds_list when it is fully ready Before this change the LED was added to leds_list before led_init_core() gets called adding it the list before led_classdev.set_brightness_work gets initialized. This leaves a window where led_trigger_register() of a LED's default trigger will call led_trigger_set() which calls led_set_brightness() which in turn will end up queueing the *uninitialized* led_classdev.set_brightness_work. This race gets hit by the lenovo-thinkpad-t14s EC driver which registers 2 LEDs with a default trigger provided by snd_ctl_led.ko in quick succession. The first led_classdev_register() causes an async modprobe of snd_ctl_led to run and that async modprobe manages to exactly hit the window where the second LED is on the leds_list without led_init_core() being called for it, resulting in: ------------[ cut here ]------------ WARNING: CPU: 11 PID: 5608 at kernel/workqueue.c:4234 __flush_work+0x344/0x390 Hardware name: LENOVO 21N2S01F0B/21N2S01F0B, BIOS N42ET93W (2.23 ) 09/01/2025 ... Call trace: __flush_work+0x344/0x390 (P) flush_work+0x2c/0x50 led_trigger_set+0x1c8/0x340 led_trigger_register+0x17c/0x1c0 led_trigger_register_simple+0x84/0xe8 snd_ctl_led_init+0x40/0xf88 [snd_ctl_led] do_one_initcall+0x5c/0x318 do_init_module+0x9c/0x2b8 load_module+0x7e0/0x998 Close the race window by moving the adding of the LED to leds_list to after the led_init_core() call.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nleds: led-class: Only Add LED to leds_list when it is fully ready\n\nBefore this change the LED was added to leds_list before led_init_core()\ngets called adding it the list before led_classdev.set_brightness_work gets\ninitialized.\n\nThis leaves a window where led_trigger_register() of a LED\u0027s default\ntrigger will call led_trigger_set() which calls led_set_brightness()\nwhich in turn will end up queueing the *uninitialized*\nled_classdev.set_brightness_work.\n\nThis race gets hit by the lenovo-thinkpad-t14s EC driver which registers\n2 LEDs with a default trigger provided by snd_ctl_led.ko in quick\nsuccession. The first led_classdev_register() causes an async modprobe of\nsnd_ctl_led to run and that async modprobe manages to exactly hit\nthe window where the second LED is on the leds_list without led_init_core()\nbeing called for it, resulting in:\n\n ------------[ cut here ]------------\n WARNING: CPU: 11 PID: 5608 at kernel/workqueue.c:4234 __flush_work+0x344/0x390\n Hardware name: LENOVO 21N2S01F0B/21N2S01F0B, BIOS N42ET93W (2.23 ) 09/01/2025\n ...\n Call trace:\n  __flush_work+0x344/0x390 (P)\n  flush_work+0x2c/0x50\n  led_trigger_set+0x1c8/0x340\n  led_trigger_register+0x17c/0x1c0\n  led_trigger_register_simple+0x84/0xe8\n  snd_ctl_led_init+0x40/0xf88 [snd_ctl_led]\n  do_one_initcall+0x5c/0x318\n  do_init_module+0x9c/0x2b8\n  load_module+0x7e0/0x998\n\nClose the race window by moving the adding of the LED to leds_list to\nafter the led_init_core() call."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nleds: led-class: Solo a\u00f1adir el LED a leds_list cuando est\u00e9 completamente listo\n\nAntes de este cambio, el LED se a\u00f1ad\u00eda a leds_list antes de que se llamara a led_init_core(), a\u00f1adi\u00e9ndolo a la lista antes de que se inicializara led_classdev.set_brightness_work.\n\nEsto deja una ventana donde led_trigger_register() del disparador predeterminado de un LED llamar\u00e1 a led_trigger_set(), que llama a led_set_brightness(), lo que a su vez terminar\u00e1 encolando el led_classdev.set_brightness_work *no inicializado*.\n\nEsta condici\u00f3n de carrera es activada por el controlador EC de lenovo-thinkpad-t14s, que registra 2 LEDs con un disparador predeterminado proporcionado por snd_ctl_led.ko en r\u00e1pida sucesi\u00f3n. La primera llamada a led_classdev_register() provoca la ejecuci\u00f3n de un modprobe as\u00edncrono de snd_ctl_led y ese modprobe as\u00edncrono logra alcanzar exactamente la ventana donde el segundo LED est\u00e1 en leds_list sin que se haya llamado a led_init_core() para \u00e9l, resultando en:\n\n ------------[ cut here ]------------\n ADVERTENCIA: CPU: 11 PID: 5608 at kernel/workqueue.c:4234 __flush_work+0x344/0x390\n Hardware name: LENOVO 21N2S01F0B/21N2S01F0B, BIOS N42ET93W (2.23 ) 09/01/2025\n ...\n Rastreo de llamadas:\n  __flush_work+0x344/0x390 (P)\n  flush_work+0x2c/0x50\n  led_trigger_set+0x1c8/0x340\n  led_trigger_register+0x17c/0x1c0\n  led_trigger_register_simple+0x84/0xe8\n  snd_ctl_led_init+0x40/0xf88 [snd_ctl_led]\n  do_one_initcall+0x5c/0x318\n  do_init_module+0x9c/0x2b8\n  load_module+0x7e0/0x998\n\nCerrar la ventana de la condici\u00f3n de carrera moviendo la adici\u00f3n del LED a leds_list a despu\u00e9s de la llamada a led_init_core()."
    }
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  "id": "CVE-2026-23101",
  "lastModified": "2026-03-19T19:33:02.937",
  "metrics": {
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          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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  "published": "2026-02-04T17:16:20.977",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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