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CVE-2026-64383

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts.

Published Jul 25, 2026EPSS 0.46%

Overview

CVE-2026-64383 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_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay

attempts. If a replayable flush response is received and the retry then

fails before cifs_send_recv() stores a replacement response, flush_exit

will free the stale response pointer a second time.

Reinitialize resp_buftype and rsp_iov at the top of the replay loop so

cleanup only acts on response state produced by the current attempt.

This fixes a double-free without changing replay handling for successful

requests.

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/013a9a3da46c5dabcf18f65ea6a47874ba12a15dRefgit.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adafRefgit.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5aRefgit.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedbRefgit.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64383?

CVE-2026-64383 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-2026-64383?

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-2026-64383?

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-2026-64383?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64383 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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