---
id: CVE-2026-23101
title: 'leds: led-class: Only Add LED to leds_list when it is fully ready'
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 li…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    f7a6df659af777058833802c29b3b7974db5e78a
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    d117fdcb21b05c0e0460261d017b92303cd9ba77
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    e90c861411fc84629a240384b0a72830539d3386
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    2757f7748ce2d0fa44112024907bafb37e104d6e
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    da565bf98c9ad0eabcb09fc97859e0b52f98b7c3
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    78822628165f3d817382f67f91129161159ca234
  - >-
    Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd <
    d1883cefd31752f0504b94c3bcfa1f6d511d6e87
  - Linux 3.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:41:07.068971Z'
published: '2026-02-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:25:30.935Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23101'
references:
  - url: 'https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a'
  - url: 'https://git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77'
  - url: 'https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386'
  - url: 'https://git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6e'
  - url: 'https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3'
  - url: 'https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234'
  - url: 'https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87'
tags:
  - cve.org
epss: 0.0014
epssPercentile: 0.03025
ingestedAt: '2026-10-19T18:35:50.104Z'
---

## Overview

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.

## Affected

- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < f7a6df659af777058833802c29b3b7974db5e78a`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < d117fdcb21b05c0e0460261d017b92303cd9ba77`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < e90c861411fc84629a240384b0a72830539d3386`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < 2757f7748ce2d0fa44112024907bafb37e104d6e`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < da565bf98c9ad0eabcb09fc97859e0b52f98b7c3`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < 78822628165f3d817382f67f91129161159ca234`
- `Linux >= d23a22a74fded23a12434c9463fe66cec2b0afcd < d1883cefd31752f0504b94c3bcfa1f6d511d6e87`
- `Linux 3.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.