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CVE-2024-50207

Estado: ModificadaMedia (5.5)—

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

ring-buffer: Fix reader locking when changing the sub buffer order

The function ring_buffer_subbuf_order_set() updates each ring_buffer_per_cpu and installs new sub buffers that match the requested page order. This operation may be invoked concurrently with readers that rely on some of the modified data, such as the head bit (RB_PAGE_HEAD), or the ring_buffer_per_cpu.pages and reader_page pointers. However, no exclusive access is acquired by ring_buffer_subbuf_order_set(). Modifying the mentioned data while a reader also operates on them can then result in incorrect memory access and various crashes.

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Fix the problem by taking the reader_lock when updating a specific ring_buffer_per_cpu in ring_buffer_subbuf_order_set().

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-2024-50207",
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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": "2025-10-01T20:17:32.092795Z"
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  "published": "2024-11-08T06:15:17.053",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix reader locking when changing the sub buffer order\n\nThe function ring_buffer_subbuf_order_set() updates each\nring_buffer_per_cpu and installs new sub buffers that match the requested\npage order. This operation may be invoked concurrently with readers that\nrely on some of the modified data, such as the head bit (RB_PAGE_HEAD), or\nthe ring_buffer_per_cpu.pages and reader_page pointers. However, no\nexclusive access is acquired by ring_buffer_subbuf_order_set(). Modifying\nthe mentioned data while a reader also operates on them can then result in\nincorrect memory access and various crashes.\n\nFix the problem by taking the reader_lock when updating a specific\nring_buffer_per_cpu in ring_buffer_subbuf_order_set()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ring-buffer: corrige el bloqueo del lector al cambiar el orden de los subbuffer La función ring_buffer_subbuf_order_set() actualiza cada ring_buffer_per_cpu e instala nuevos subbuffers que coinciden con el orden de páginas solicitado. Esta operación se puede invocar simultáneamente con lectores que dependen de algunos de los datos modificados, como el bit de cabecera (RB_PAGE_HEAD) o los punteros ring_buffer_per_cpu.pages y reader_page. Sin embargo, ring_buffer_subbuf_order_set() no adquiere acceso exclusivo. Modificar los datos mencionados mientras un lector también opera sobre ellos puede provocar un acceso incorrecto a la memoria y varios fallos. Solucione el problema tomando el reader_lock al actualizar un ring_buffer_per_cpu específico en ring_buffer_subbuf_order_set()."
    }
  ],
  "lastModified": "2026-08-04T11:21:32.520",
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