CVE-2026-64395
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < 2d2ab6983620c2d60ce7db72133984ca3873b929 | affected |
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < 67bdad9cf01b25030e3bf00bbce6c309319d6663 | affected |
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f | affected |
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < db231af842868268839f9f9619c68cb27830d8be | affected |
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < a10942af27832c2761d020863a46e79bebe0567d | affected |
| Linux | Linux | eb817368f50c1cbe1bd07044124aad7db6330e3a < cedff600f1642aa982178503552f0d007bc829c8 | affected |
| Linux | Linux | 5.15 | affected |
| Linux | Linux | 0 < 5.15 | unaffected |
| Linux | Linux | 6.1.178 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.145 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.96 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.39 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.4 <= 7.1.* | unaffected |
| Linux | Linux | 7.2-rc1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929
- https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663
- https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f
- https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be
- https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d
- https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8
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