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CVE-2026-64380

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: harden POSIX SID length parsing posix_info_sid_size() reads sid[1] to obtain the subauthority count, but its exist…

Published Jul 25, 2026EPSS 0.44%

Overview

CVE-2026-64380 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, 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:

smb: client: harden POSIX SID length parsing

posix_info_sid_size() reads sid[1] to obtain the subauthority count,

but its existing boundary check still accepts buffers with only one

remaining byte. Require two bytes before reading sid[1] so all client

paths that reuse the helper reject truncated POSIX SIDs safely.

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/0de5b8e76847f5de26f364a82c6602c4881c30daRefgit.kernel.org/stable/c/171605aed68380c2fa75dff9b3a1ed427c50065bRefgit.kernel.org/stable/c/4213c1208978483021d7d125c131de3985d38f61Refgit.kernel.org/stable/c/427eb7eb46425fec845a43e861f3d6e2899cae59Refgit.kernel.org/stable/c/46a84715a015cb48e1b9c219dc88c03d8a541ea4Refgit.kernel.org/stable/c/7ad2bcf2441430bb2e918fb3ef9a90d775a6e422Refgit.kernel.org/stable/c/86c5d470f5d42e61123b2f4b4f0b91f4eee5b980Refgit.kernel.org/stable/c/96e889bc1e759c83f25093e8c2f3da31b4973f30

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64380?

CVE-2026-64380 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-64380?

This vulnerability has a CVSS 3.1 base score of 8.2, 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-2026-64380?

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-2026-64380?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64380 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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