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Vulnerability record · CVE-2026-64395 · published 25 July 2026

CVE-2026-64395: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.55% · top 56.0%
7.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
4 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929 Patch
https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663 Patch
https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d Patch
https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f Patch
https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8 Patch
https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64395), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.