High severity7.5NVD Advisory· Published Jul 25, 2026· Updated Aug 17, 2026
CVE-2026-64395
CVE-2026-64395
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
4- osv-coords2 versions
>= 5.15.0, < 6.1.178+ 1 more
- (no CPE)range: >= 5.15.0, < 6.1.178
- (no CPE)range: < 7.1.7-1.1
Patches
Vulnerability mechanics
References
6- git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929nvd
- git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663nvd
- git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567dnvd
- git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5fnvd
- git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8nvd
- git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8benvd
News mentions
0No linked articles in our index yet.