CVE-2026-64395
Last modified
CVE-2026-64395 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < 2d2ab6983620c2d60ce7db72133984ca3873b929; >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < 67bdad9cf01b25030e3bf00bbce6c309319d6663; >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f; >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < db231af842868268839f9f9619c68cb27830d8be; >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < a10942af27832c2761d020863a46e79bebe0567d; >= eb817368f50c1cbe1bd07044124aad7db6330e3a, < cedff600f1642aa982178503552f0d007bc829c8 |
| Linux | Linux | 5.15 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Scan your code nowSource: NVD / NIST