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CVE-2026-89687

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file ->atomic_open is permitted to return success without actuall…

Published Sep 11, 2026EPSS 0.49%

Overview

CVE-2026-89687 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, 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:

nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file

->atomic_open is permitted to return success without actually opening

the file. It indicates this by calling finish_no_open().

This means dentry_create() can return a file which hasn't been opened.

This is extremely unlikely as ->atomic_open handlers typically

use finish_no_open() only for already existing files, and dentry_create()

isn't called in that case, and the parent being locked should prevent

races.

However out of an abundance of caution it seems wise to teach nfsd to

only use the file returned by dentry_create() if FMODE_OPENED is set,

indicating that it has in fact been opened.

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/5859cc01fee06a2cd7458905a9593082fbab06e1Refgit.kernel.org/stable/c/a95a1cffacd0203100297001719160160f443dd6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89687?

CVE-2026-89687 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-89687?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2026-89687?

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-2026-89687?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89687 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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