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

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-09 08:38
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 , ≤ * (original_commit_for_fix)
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          "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": "2026-02-09T08:38:42.041Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-02-04T16:08:23.329Z",
    "dateReserved": "2026-01-13T15:37:45.965Z",
    "dateUpdated": "2026-02-09T08:38:42.041Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23101\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:20.977\",\"lastModified\":\"2026-03-19T19:33:02.937\",\"vulnStatus\":\"Analyzed\",\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nleds: led-class: Solo a\u00f1adir el LED a leds_list cuando est\u00e9 completamente listo\\n\\nAntes de este cambio, el LED se a\u00f1ad\u00eda a leds_list antes de que se llamara a led_init_core(), a\u00f1adi\u00e9ndolo a la lista antes de que se inicializara led_classdev.set_brightness_work.\\n\\nEsto deja una ventana donde led_trigger_register() del disparador predeterminado de un LED llamar\u00e1 a led_trigger_set(), que llama a led_set_brightness(), lo que a su vez terminar\u00e1 encolando el led_classdev.set_brightness_work *no inicializado*.\\n\\nEsta condici\u00f3n de carrera es activada por el controlador EC de lenovo-thinkpad-t14s, que registra 2 LEDs con un disparador predeterminado proporcionado por snd_ctl_led.ko en r\u00e1pida sucesi\u00f3n. La primera llamada a led_classdev_register() provoca la ejecuci\u00f3n de un modprobe as\u00edncrono de snd_ctl_led y ese modprobe as\u00edncrono logra alcanzar exactamente la ventana donde el segundo LED est\u00e1 en leds_list sin que se haya llamado a led_init_core() para \u00e9l, resultando en:\\n\\n ------------[ cut here ]------------\\n ADVERTENCIA: 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 Rastreo de llamadas:\\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\\nCerrar la ventana de la condici\u00f3n de carrera moviendo la adici\u00f3n del LED a leds_list a despu\u00e9s de la llamada a led_init_core().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.7\",\"versionEndExcluding\":\"5.10.249\",\"matchCriteriaId\":\"3426920A-E477-43B8-9E72-5B245C924157\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.199\",\"matchCriteriaId\":\"A247FBA6-BEB9-484F-B892-DD5517949CCD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.162\",\"matchCriteriaId\":\"6579E0D4-0641-479D-A4C3-0EF618798C55\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.122\",\"matchCriteriaId\":\"8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.68\",\"matchCriteriaId\":\"52F38E19-0FDD-4992-9D6D-D4169D689598\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.8\",\"matchCriteriaId\":\"E65C6E79-7EBE-4C77-93F0-818CF5B38F4E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2757f7748ce2d0fa44112024907bafb37e104d6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/78822628165f3d817382f67f91129161159ca234\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d117fdcb21b05c0e0460261d017b92303cd9ba77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d1883cefd31752f0504b94c3bcfa1f6d511d6e87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da565bf98c9ad0eabcb09fc97859e0b52f98b7c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e90c861411fc84629a240384b0a72830539d3386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f7a6df659af777058833802c29b3b7974db5e78a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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