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GHSA-2FP3-4QP4-W8M7

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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

xen/gntdev: fix error handling in ioctl

When gntdev_ioctl_map_grant_ref() fails to copy the operation result back to userspace after successfully adding the mapping to the list, the error path returns -EFAULT without releasing the reference acquired by gntdev_alloc_map(). The mapping remains in priv->maps with a refcount of 1, causing a memory leak and a dangling list entry.

Additionally, gntdev_add_map() may modify map->index to avoid overlap with existing mappings. Therefore, the index returned to userspace must be obtained after gntdev_add_map() completes.

Fix this by holding the mutex across gntdev_add_map(), retrieving the correct index, and copy_to_user(). If copy_to_user() fails, remove the mapping from the list and release the reference while still holding the lock.

Fix these issues by properly handling all error cases.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72138"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/gntdev: fix error handling in ioctl\n\nWhen gntdev_ioctl_map_grant_ref() fails to copy the operation result\nback to userspace after successfully adding the mapping to the list,\nthe error path returns -EFAULT without releasing the reference\nacquired by gntdev_alloc_map(). The mapping remains in priv-\u003emaps\nwith a refcount of 1, causing a memory leak and a dangling list\nentry.\n\nAdditionally, gntdev_add_map() may modify map-\u003eindex to avoid overlap\nwith existing mappings. Therefore, the index returned to userspace\nmust be obtained after gntdev_add_map() completes.\n\nFix this by holding the mutex across gntdev_add_map(), retrieving\nthe correct index, and copy_to_user(). If copy_to_user() fails,\nremove the mapping from the list and release the reference while\nstill holding the lock.\n\n\nFix these issues by properly handling all error cases.",
  "id": "GHSA-2fp3-4qp4-w8m7",
  "modified": "2026-08-15T06:32:13Z",
  "published": "2026-08-15T06:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72138"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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