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CVE-2026-64257

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exempti…

Published Jul 25, 2026EPSS 0.70%

Overview

CVE-2026-64257 is a critical-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. 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:

smb: client: reject overlapping data areas in SMB2 responses

Commit 53b7c271f06b ("smb: client: restrict implied bcc[0] exemption to

responses without data area") restricted the implied bcc[0] length

exception to responses without a data area. However, the overlap

handling in __smb2_calc_size() clears data_length, which can make an

invalid response appear to have no data area and so qualify for the

exception.

Track data area overlap separately and reject such responses before

applying the length compatibility exceptions.

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/36bfa52459e45c0d5b668de2f1c91f6dc5c67775Refgit.kernel.org/stable/c/445ece263131780dee273d727a4d6f11934feec7Refgit.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275fRefgit.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460Refgit.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1feRefgit.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64257?

CVE-2026-64257 is a critical-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-64257?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64257?

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-2026-64257?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64257 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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