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CVE-2022-50091

Estado: AnalizadaMedia (5.5)—

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

locking/csd_lock: Change csdlock_debug from early_param to __setup

The csdlock_debug kernel-boot parameter is parsed by the early_param() function csdlock_debug(). If set, csdlock_debug() invokes static_branch_enable() to enable csd_lock_wait feature, which triggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and CONFIG_SPARSEMEM_VMEMMAP=n.

With CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in static_key_enable() and returns NULL, resulting in a NULL dereference because mem_section is initialized only later in sparse_init().

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This is also a problem for powerpc because early_param() functions are invoked earlier than jump_label_init(), also resulting in static_key_enable() failures. These failures cause the warning "static key 'xxx' used before call to jump_label_init()".

Thus, early_param is too early for csd_lock_wait to run static_branch_enable(), so changes it to __setup to fix these.

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-2022-50091",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "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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  "published": "2025-06-18T11:15:38.277",
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      "description": [
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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\nlocking/csd_lock: Change csdlock_debug from early_param to __setup\n\nThe csdlock_debug kernel-boot parameter is parsed by the\nearly_param() function csdlock_debug().  If set, csdlock_debug()\ninvokes static_branch_enable() to enable csd_lock_wait feature, which\ntriggers a panic on arm64 for kernels built with CONFIG_SPARSEMEM=y and\nCONFIG_SPARSEMEM_VMEMMAP=n.\n\nWith CONFIG_SPARSEMEM_VMEMMAP=n, __nr_to_section is called in\nstatic_key_enable() and returns NULL, resulting in a NULL dereference\nbecause mem_section is initialized only later in sparse_init().\n\nThis is also a problem for powerpc because early_param() functions\nare invoked earlier than jump_label_init(), also resulting in\nstatic_key_enable() failures.  These failures cause the warning \"static\nkey 'xxx' used before call to jump_label_init()\".\n\nThus, early_param is too early for csd_lock_wait to run\nstatic_branch_enable(), so changes it to __setup to fix these."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: locking/csd_lock: Cambiar csdlock_debug de early_param a __setup El parámetro csdlock_debug kernel-boot es analizado por la función early_param() csdlock_debug(). Si se establece, csdlock_debug() invoca static_branch_enable() para habilitar la función csd_lock_wait, que desencadena un pánico en arm64 para kernels compilados con CONFIG_SPARSEMEM=y y CONFIG_SPARSEMEM_VMEMMAP=n. Con CONFIG_SPARSEMEM_VMEMMAP=n, se llama a __nr_to_section en static_key_enable() y devuelve NULL, lo que resulta en una desreferencia NULL porque mem_section se inicializa solo más tarde en sparse_init(). Esto también representa un problema para PowerPC, ya que las funciones early_param() se invocan antes que jump_label_init(), lo que también provoca fallos en static_key_enable(). Estos fallos generan la advertencia \"Clave estática 'xxx' usada antes de la llamada a jump_label_init()\". Por lo tanto, early_param es demasiado pronto para que csd_lock_wait ejecute static_branch_enable(), por lo que se cambia a __setup para solucionarlos."
    }
  ],
  "lastModified": "2026-06-17T05:22:44.470",
  "configurations": [
    {
      "nodes": [
        {
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