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CVE-2026-64385

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_ioctl() replay A response-bearing attempt can return a replayable error and free its respo…

Published Jul 25, 2026EPSS 0.46%

Overview

CVE-2026-64385 is a critical-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, 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: fix double-free in SMB2_ioctl() replay

A response-bearing attempt can return a replayable error and free its

response buffer. If SMB2_ioctl_init() fails before the next send, cleanup

retains the previous buffer type and frees that response again.

Reset response bookkeeping before each attempt to prevent the stale free.

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/0be4bc64882edaefaaee8d1e27d083643eb778e6Refgit.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3bRefgit.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6Refgit.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9Refgit.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64385?

CVE-2026-64385 is a critical-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64385?

This vulnerability has a CVSS 3.1 base score of 9.8, 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-2026-64385?

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-2026-64385?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64385 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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