VULNERABILITY INTELLIGENCE
CVE-2026-64395
CVSS score7.5 HIGH
EPSS probability0.41%
CISA KEVNot currently listed
Published2026-07-25
Last modified2026-09-04
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Weakness classification
- nvd@nist.gov: NVD-CWE-noinfo