CVE-2026-64395
ksmbd: require source read access for duplicate extents
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 25, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
eb817368f50c1cbe1bd07044124aad7db6330e3a < 2d2ab6983620c2d60ce7db72133984ca3873b929 eb817368f50c1cbe1bd07044124aad7db6330e3a < 67bdad9cf01b25030e3bf00bbce6c309319d6663 eb817368f50c1cbe1bd07044124aad7db6330e3a < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f eb817368f50c1cbe1bd07044124aad7db6330e3a < db231af842868268839f9f9619c68cb27830d8be eb817368f50c1cbe1bd07044124aad7db6330e3a < a10942af27832c2761d020863a46e79bebe0567d eb817368f50c1cbe1bd07044124aad7db6330e3a < cedff600f1642aa982178503552f0d007bc829c8
Linux / Linux
5.15
References
git.kernel.org: https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929 git.kernel.org: https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663 git.kernel.org: https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f git.kernel.org: https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be git.kernel.org: https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d git.kernel.org: https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8