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CVE-2026-64015

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in…

Published Jul 19, 2026EPSS 0.20%

Overview

CVE-2026-64015 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

security/keys: fix missed RCU read section on lookup

Nicholas Carlini reports that the keyring code calls assoc_array_find()

in find_key_to_update() without holding the RCU read lock, while the

assoc_array_gc() code really is designed around removing the node from

the tree and then freeing it after an RCU grace-period.

The regular key handling doesn't see this because holding the keyring

semaphore hides any lifetime issues, but the persistent key handling

uses a different model.

Instead of extending the keyring locking, just do the simple RCU locking

that the assoc_array was designed for.

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/43a1e3744548e6fd85873e6fb43e293eb4010694Refgit.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edcRefgit.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8Refgit.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195Refgit.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5Refgit.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64015?

CVE-2026-64015 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64015?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64015?

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-2026-64015?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64015 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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