CVE-2026-64395 | 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
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.
- 🔗 git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca…
- 🔗 git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309…
- 🔗 git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4…
- 🔗 git.kernel.org/stable/c/db231af842868268839f9f9619c68cb2…
- 🔗 git.kernel.org/stable/c/a10942af27832c2761d020863a46e79b…
- 🔗 git.kernel.org/stable/c/cedff600f1642aa982178503552f0d00…
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| Tier | 2026-08-29 | 2026-09-14 |
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CVE-2026-64395 | 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
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()