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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-23101
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-04 17:16:20 UTC
Updated2026-10-19 19:17:36 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-908 | CWE-362 | CWE-362 CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd f7a6df659af777058833802c29b3b7974db5e78a git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd d117fdcb21b05c0e0460261d017b92303cd9ba77 git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd e90c861411fc84629a240384b0a72830539d3386 git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd 2757f7748ce2d0fa44112024907bafb37e104d6e git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd da565bf98c9ad0eabcb09fc97859e0b52f98b7c3 git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd 78822628165f3d817382f67f91129161159ca234 git Not specified
CNA Linux Linux affected d23a22a74fded23a12434c9463fe66cec2b0afcd d1883cefd31752f0504b94c3bcfa1f6d511d6e87 git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 5.10.249 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.199 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.162 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.122 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.68 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.8 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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