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FKIE_CVE-2026-72138

Vulnerability from fkie_nvd - Published: 2026-08-15 06:21 - Updated: 2026-08-17 06:18
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/gntdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "52dc40ef0cfee6ae89b7524967e73f0ba37906d7",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "1dd9cb98fe228e017fff9efb33862ff38c741b65",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "6df926130aee6cab9b5d2e5b7862e49ccac348dc",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "311011f8cc206c5af2877b03e3f627ee1b8fe024",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "18a693733f7ad004e1ab0466693121ca70cd95dd",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "6883269a323609f68f6faa903f8f8ff3d191cec8",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            },
            {
              "lessThan": "45ca1afe2fd14c04e37227e79d3f8455831d8408",
              "status": "affected",
              "version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/gntdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.39"
            },
            {
              "lessThan": "2.6.39",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-72138",
  "lastModified": "2026-08-17T06:18:13.703",
  "metrics": {},
  "published": "2026-08-15T06:21:31.337",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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