CVE-2026-23101 (GCVE-0-2026-23101)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-06 16:33
VLAI?
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 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < f7a6df659af777058833802c29b3b7974db5e78a (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < d117fdcb21b05c0e0460261d017b92303cd9ba77 (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < e90c861411fc84629a240384b0a72830539d3386 (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < 2757f7748ce2d0fa44112024907bafb37e104d6e (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < da565bf98c9ad0eabcb09fc97859e0b52f98b7c3 (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < 78822628165f3d817382f67f91129161159ca234 (git)
Affected: d23a22a74fded23a12434c9463fe66cec2b0afcd , < d1883cefd31752f0504b94c3bcfa1f6d511d6e87 (git)
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    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc7 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/leds/led-class.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.7"
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              "version": "0",
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              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.68",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc7",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-06T16:33:23.688Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a"
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          "url": "https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386"
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          "url": "https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3"
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          "url": "https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87"
        }
      ],
      "title": "leds: led-class: Only Add LED to leds_list when it is fully ready",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23101",
    "datePublished": "2026-02-04T16:08:23.329Z",
    "dateReserved": "2026-01-13T15:37:45.965Z",
    "dateUpdated": "2026-02-06T16:33:23.688Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23101\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:20.977\",\"lastModified\":\"2026-02-06T17:16:25.317\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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