Vulnerability-Lookup

GHSA-33Q2-XQVR-5V3J

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

ksmbd: require source read access for duplicate extents

FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination.

Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64395"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:22Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: require source read access for duplicate extents\n\nFSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to\nvfs_clone_file_range() or vfs_copy_file_range() without checking the SMB\naccess mask granted to the source handle. A handle opened with attribute\naccess can consequently be used to copy file contents into an\nattacker-readable destination.\n\nRequire FILE_READ_DATA on the source handle before either VFS operation,\nmatching other ksmbd data-copy paths.",
  "id": "GHSA-33q2-xqvr-5v3j",
  "modified": "2026-07-25T12:31:34Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64395 (GCVE-0-2026-64395)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

ksmbd: require source read access for duplicate extents

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/2d2ab6983620c2d60…
https://git.kernel.org/stable/c/67bdad9cf01b25030…
https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7…
https://git.kernel.org/stable/c/db231af8428682688…
https://git.kernel.org/stable/c/a10942af27832c276…
https://git.kernel.org/stable/c/cedff600f1642aa98…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2d2ab6983620c2d60ce7db72133984ca3873b929 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 67bdad9cf01b25030e3bf00bbce6c309319d6663 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db231af842868268839f9f9619c68cb27830d8be (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a10942af27832c2761d020863a46e79bebe0567d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cedff600f1642aa982178503552f0d007bc829c8 (git) Affected: 0 , < 6.1.178 (semver) Affected: 0 , < 6.6.145 (semver) Affected: 0 , < 6.12.96 (semver) Affected: 0 , < 6.18.39 (semver) Affected: 0 , < 7.1.4 (semver)
Linux	Linux	Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
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              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
              "lessThan": "cedff600f1642aa982178503552f0d007bc829c8",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "status": "affected",
              "version": "0",
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            {
              "lessThan": "6.6.145",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThan": "6.12.96",
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "vulnerable": true
                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: require source read access for duplicate extents\n\nFSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to\nvfs_clone_file_range() or vfs_copy_file_range() without checking the SMB\naccess mask granted to the source handle. A handle opened with attribute\naccess can consequently be used to copy file contents into an\nattacker-readable destination.\n\nRequire FILE_READ_DATA on the source handle before either VFS operation,\nmatching other ksmbd data-copy paths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:40.393Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929"
        },
        {
          "url": "https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663"
        },
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        },
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8"
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      ],
      "title": "ksmbd: require source read access for duplicate extents",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64395",
    "datePublished": "2026-07-25T08:50:40.393Z",
    "dateReserved": "2026-07-19T15:36:31.785Z",
    "dateUpdated": "2026-07-25T08:50:40.393Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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GHSA-33Q2-XQVR-5V3J

CVE-2026-64395 (GCVE-0-2026-64395)

Tags

Sightings

Nomenclature