Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-23101

leds: led-class: Only Add LED to leds_list when it is fully ready

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux 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 Linux

    3.7

  • KernelLinux

    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

References 7

git.kernel.org