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CVE-2026-93823

Estado: RecibidaSin puntuar—

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

drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

amdkfd driver needs allocate buffer to return bo metadata to user space. The buffer size is controlled by user currently. It is a potential security issue that hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX allocation/OOM in kernel context.

This patch first finds bo metadata size. If the size is smaller than user provided value drive can safely allocate buffer in kernel space and copy to user space buffer. If not, driver will let user know, not allocate and copy. User will redo with new buffer in user space.

Leer descripción completaMostrar menos

This patch lets driver decide buffer allocation size to avoid potential hostile size from user space.

(cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-93823",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "1dde0ea95b782425b95455d487cb44991525a1d1",
              "lessThan": "d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1dde0ea95b782425b95455d487cb44991525a1d1",
              "lessThan": "a65ccabde6deb95baf9442bd98299e2248884162",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1dde0ea95b782425b95455d487cb44991525a1d1",
              "lessThan": "2d9fd0f01550aab4a0a1984b4379e50545906248",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1dde0ea95b782425b95455d487cb44991525a1d1",
              "lessThan": "8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h",
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h",
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:15.947",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2d9fd0f01550aab4a0a1984b4379e50545906248",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a65ccabde6deb95baf9442bd98299e2248884162",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl\n\namdkfd driver needs allocate buffer to return bo metadata to user space. The\nbuffer size is controlled by user currently. It is a potential security issue\nthat hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX\nallocation/OOM in kernel context.\n\nThis patch first finds bo metadata size. If the size is smaller than user\nprovided value drive can safely allocate buffer in kernel space and copy to\nuser space buffer. If not, driver will let user know, not allocate and copy.\nUser will redo with new buffer in user space.\n\nThis patch lets driver decide buffer allocation size to avoid potential hostile\nsize from user space.\n\n(cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)"
    }
  ],
  "lastModified": "2026-10-03T11:17:52.120",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}