CVE-2026-64395

UNKNOWN 0.0

ksmbd: require source read access for duplicate extents

CVSS Score

0.0

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	Linux Kernel
Industries	Technology
Published	Jul 25, 2026

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Affected Versions

Linux / Linux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2d2ab6983620c2d60ce7db72133984ca3873b929 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 67bdad9cf01b25030e3bf00bbce6c309319d6663 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db231af842868268839f9f9619c68cb27830d8be 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a10942af27832c2761d020863a46e79bebe0567d 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cedff600f1642aa982178503552f0d007bc829c8 0 < 6.1.178 0 < 6.6.145 0 < 6.12.96 0 < 6.18.39 0 < 7.1.4

Linux / Linux

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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