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CVE-2024-49941

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

gpiolib: Fix potential NULL pointer dereference in gpiod_get_label()

In `gpiod_get_label()`, it is possible that `srcu_dereference_check()` may return a NULL pointer, leading to a scenario where `label->str` is accessed without verifying if `label` itself is NULL.

This patch adds a proper NULL check for `label` before accessing `label->str`. The check for `label->str != NULL` is removed because `label->str` can never be NULL if `label` is not NULL.

This fixes the issue where the label name was being printed as `(efault)` when dumping the sysfs GPIO file when `label == NULL`.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2024-49941",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2024-10-22T13:37:44.721753Z"
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          "attackVector": "LOCAL",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "programFiles": [
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  "published": "2024-10-21T18:15:15.780",
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      "url": "https://git.kernel.org/stable/c/7b99b5ab885993bff010ebcd93be5e511c56e28a",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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          "value": "CWE-476"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: Fix potential NULL pointer dereference in gpiod_get_label()\n\nIn `gpiod_get_label()`, it is possible that `srcu_dereference_check()` may\nreturn a NULL pointer, leading to a scenario where `label->str` is accessed\nwithout verifying if `label` itself is NULL.\n\nThis patch adds a proper NULL check for `label` before accessing\n`label->str`. The check for `label->str != NULL` is removed because\n`label->str` can never be NULL if `label` is not NULL.\n\nThis fixes the issue where the label name was being printed as `(efault)`\nwhen dumping the sysfs GPIO file when `label == NULL`."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gpiolib: Corrige la posible desreferencia de puntero NULL en gpiod_get_label() En `gpiod_get_label()`, es posible que `srcu_dereference_check()` pueda devolver un puntero NULL, lo que lleva a un escenario en el que se accede a `label->str` sin verificar si `label` en sí es NULL. Este parche agrega una comprobación NULL adecuada para `label` antes de acceder a `label->str`. La comprobación para `label->str != NULL` se elimina porque `label->str` nunca puede ser NULL si `label` no es NULL. Esto corrige el problema en el que el nombre de la etiqueta se imprimía como `(efault)` al volcar el archivo GPIO de sysfs cuando `label == NULL`."
    }
  ],
  "lastModified": "2026-06-17T08:00:46.917",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
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              "versionEndExcluding": "6.11.3",
              "versionStartIncluding": "6.9"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}