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CVE-2026-64395

7.5 · HIGH

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_…

Published Jul 25, 2026EPSS 0.41%

Overview

CVE-2026-64395 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929Refgit.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663Refgit.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567dRefgit.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5fRefgit.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8Refgit.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64395?

CVE-2026-64395 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-64395?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64395?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64395?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64395 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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