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.
Affected products
linux: linux kernel
References6
- git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929 Patch
- git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663 Patch
- git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d Patch
- git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f Patch
- git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8 Patch
- git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be Patch
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 35 · as of 14 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.