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CVE-2025-38008

Estado: AnalizadaMedia (4.7)—

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

mm/page_alloc: fix race condition in unaccepted memory handling

The page allocator tracks the number of zones that have unaccepted memory using static_branch_enc/dec() and uses that static branch in hot paths to determine if it needs to deal with unaccepted memory.

Borislav and Thomas pointed out that the tracking is racy: operations on static_branch are not serialized against adding/removing unaccepted pages to/from the zone.

Sanity checks inside static_branch machinery detects it:

The comment around the WARN() explains the problem:

Leer descripción completaMostrar menos

/* * Warn about the '-1' case though; since that means a * decrement is concurrent with a first (0->1) increment. IOW * people are trying to disable something that wasn't yet fully * enabled. This suggests an ordering problem on the user side. */

The effect of this static_branch optimization is only visible on microbenchmark.

Instead of adding more complexity around it, remove it altogether.

Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0

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-2025-38008",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
      }
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  "published": "2025-06-18T10:15:32.037",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: fix race condition in unaccepted memory handling\n\nThe page allocator tracks the number of zones that have unaccepted memory\nusing static_branch_enc/dec() and uses that static branch in hot paths to\ndetermine if it needs to deal with unaccepted memory.\n\nBorislav and Thomas pointed out that the tracking is racy: operations on\nstatic_branch are not serialized against adding/removing unaccepted pages\nto/from the zone.\n\nSanity checks inside static_branch machinery detects it:\n\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\n\nThe comment around the WARN() explains the problem:\n\n\t/*\n\t * Warn about the '-1' case though; since that means a\n\t * decrement is concurrent with a first (0->1) increment. IOW\n\t * people are trying to disable something that wasn't yet fully\n\t * enabled. This suggests an ordering problem on the user side.\n\t */\n\nThe effect of this static_branch optimization is only visible on\nmicrobenchmark.\n\nInstead of adding more complexity around it, remove it altogether."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/page_alloc: arregla la condición de ejecución en el manejo de memoria no aceptada El asignador de páginas rastrea el número de zonas que tienen memoria no aceptada usando static_branch_enc/dec() y usa esa rama estática en rutas activas para determinar si necesita lidiar con memoria no aceptada. Borislav y Thomas señalaron que el rastreo es acelerado: las operaciones en static_branch no se serializan contra la adición/eliminación de páginas no aceptadas a/desde la zona. Las comprobaciones de cordura dentro de la maquinaria static_branch lo detectan: ADVERTENCIA: CPU: 0 PID: 10 en kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 El comentario alrededor de WARN() explica el problema: /* * Sin embargo, advierte sobre el caso '-1'; ya que eso significa que un * decremento es concurrente con un primer incremento (0->1). Es decir, * se está intentando deshabilitar algo que aún no estaba completamente habilitado. Esto sugiere un problema de ordenamiento del usuario. */ El efecto de esta optimización de static_branch solo es visible en microbenchmark. En lugar de añadir más complejidad, elimínenla por completo."
    }
  ],
  "lastModified": "2026-06-17T09:15:52.390",
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