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CVE-2026-64392

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, wher…

Published Jul 25, 2026EPSS 0.47%

Overview

CVE-2026-64392 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:

ksmbd: use opener credentials for delete-on-close

Delete-on-close can be completed by deferred or durable handle teardown,

where no request work is available. Both the base-file unlink and the ADS

xattr removal consequently run with the ksmbd worker credentials and can

bypass filesystem permission checks.

Run both operations with the credentials captured in struct file when the

handle was opened. This preserves the authenticated user's fsuid, fsgid,

supplementary groups and capability restrictions at final close.

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/18c59109bb6fb816d5102171666f87cf1e29901dRefgit.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817dRefgit.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0Refgit.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9Refgit.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64392?

CVE-2026-64392 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-2026-64392?

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-2026-64392?

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-2026-64392?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64392 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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