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CVE-2025-38672

Estado: AnalizadaMedia (5.5)—

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

Revert "drm/gem-dma: Use dma_buf from GEM object instance"

This reverts commit e8afa1557f4f963c9a511bd2c6074a941c308685.

The dma_buf field in struct drm_gem_object is not stable over the object instance's lifetime. The field becomes NULL when user space releases the final GEM handle on the buffer object. This resulted in a NULL-pointer deref.

Workarounds in commit 5307dce878d4 ("drm/gem: Acquire references on GEM handles for framebuffers") and commit f6bfc9afc751 ("drm/framebuffer: Acquire internal references on GEM handles") only solved the problem partially. They especially don't work for buffer objects without a DRM framebuffer associated.

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Hence, this revert to going back to using .import_attach->dmabuf.

v3: - cc stable

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-2025-38672",
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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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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          "product": "Linux",
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          "defaultStatus": "unaffected"
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              "version": "6.16",
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          "programFiles": [
            "drivers/gpu/drm/drm_gem_dma_helper.c"
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          "defaultStatus": "affected"
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      ]
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  ],
  "published": "2025-08-22T16:15:42.820",
  "references": [
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      "url": "https://git.kernel.org/stable/c/1918e79be908b8a2c8757640289bc196c14d928a",
      "tags": [
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      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"drm/gem-dma: Use dma_buf from GEM object instance\"\n\nThis reverts commit e8afa1557f4f963c9a511bd2c6074a941c308685.\n\nThe dma_buf field in struct drm_gem_object is not stable over the\nobject instance's lifetime. The field becomes NULL when user space\nreleases the final GEM handle on the buffer object. This resulted\nin a NULL-pointer deref.\n\nWorkarounds in commit 5307dce878d4 (\"drm/gem: Acquire references on\nGEM handles for framebuffers\") and commit f6bfc9afc751 (\"drm/framebuffer:\nAcquire internal references on GEM handles\") only solved the problem\npartially. They especially don't work for buffer objects without a DRM\nframebuffer associated.\n\nHence, this revert to going back to using .import_attach->dmabuf.\n\nv3:\n- cc stable"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Revertir \"drm/gem-dma: Usar dma_buf de la instancia del objeto GEM\". Esto revierte el commit e8afa1557f4f963c9a511bd2c6074a941c308685. El campo dma_buf en la estructura drm_gem_object no es estable durante la vida útil de la instancia del objeto. El campo se vuelve nulo cuando el espacio de usuario libera el identificador GEM final en el objeto de búfer. Esto resultó en una desreferencia de puntero nulo. Las soluciones alternativas en los commit 5307dce878d4 (\"drm/gem: Adquirir referencias en identificadores GEM para framebuffers\") y f6bfc9afc751 (\"drm/framebuffer: Adquirir referencias internas en identificadores GEM\") solo resolvieron el problema parcialmente. En particular, no funcionan con objetos de búfer sin un framebuffer DRM asociado. Por lo tanto, volvemos a utilizar .import_attach->dmabuf. v3: - cc estable"
    }
  ],
  "lastModified": "2026-06-17T09:17:37.707",
  "configurations": [
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