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GHSA-3R89-CXVF-8CX5

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
Details

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

drm/vmwgfx: drop dma_buf reference on foreign-fd prime import

ttm_prime_fd_to_handle() returns -ENOSYS when the imported fd's dma_buf->ops do not match the ttm_object_device's ops, but does so without releasing the reference acquired by dma_buf_get(). Any unprivileged renderD client passing a non-vmwgfx prime fd through the DRM_VMW_GB_SURFACE_REF{,_EXT} path leaks one dma_buf reference per call and indefinitely pins the foreign exporter's GEM resources.

Funnel the error path through the existing dma_buf_put() so the reference is always dropped.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80888"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T18:17:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: drop dma_buf reference on foreign-fd prime import\n\nttm_prime_fd_to_handle() returns -ENOSYS when the imported fd\u0027s\ndma_buf-\u003eops do not match the ttm_object_device\u0027s ops, but does so\nwithout releasing the reference acquired by dma_buf_get().  Any\nunprivileged renderD client passing a non-vmwgfx prime fd through the\nDRM_VMW_GB_SURFACE_REF{,_EXT} path leaks one dma_buf reference per\ncall and indefinitely pins the foreign exporter\u0027s GEM resources.\n\nFunnel the error path through the existing dma_buf_put() so the\nreference is always dropped.",
  "id": "GHSA-3r89-cxvf-8cx5",
  "modified": "2026-09-04T18:31:33Z",
  "published": "2026-09-04T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80888"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4df39eb99bb47d1f24d1952c23b21b10988356bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/619c3cfa88e09603a13d918f754808db2dda7057"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1e972fa94c3a8069e022c67b9d97c7aa7b05293"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8434b145b1e467940334c58c00af241e9494c5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1c22fca0a0896a452a7cb92422d67babd65b4be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f739416dc555fa205a785e5135d73fa39b26f35d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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