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

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-10-19 18:25
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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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."
          },
          {
            "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()."
          }
        ],
        "id": "CVE-2026-23101",
        "lastModified": "2026-10-19T19:17:36.423",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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          "ssvcV203": [
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              "ssvcData": {
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                  {
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:41:07.068971Z",
                "version": "2.0.3"
              }
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        "published": "2026-02-04T17:16:20.977",
        "references": [
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          {
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
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                "value": "CWE-908"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
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              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T11:18:14+00:00",
      "cve": "CVE-2026-23101",
      "id": "CVE-2026-23101",
      "initial_release_date": "2026-02-04T00:00:00+00:00",
      "product_status:known_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: leds: led-class: Only Add LED to leds_list when it is fully ready",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23101.json",
      "version": "3"
    },
    "vulnrichment": {
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                      },
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                      }
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                }
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            ],
            "problemTypes": [
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                  {
                    "cweId": "CWE-362",
                    "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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              ],
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              "vendor": "Linux",
              "versions": [
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                  "version": "3.7"
                },
                {
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                  "version": "0",
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                  "version": "6.19",
                  "versionType": "original_commit_for_fix"
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          "cpeApplicability": [
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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."
            }
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        "dateUpdated": "2026-10-19T18:25:30.935Z",
        "state": "PUBLISHED"
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  }
}



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