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CVE-2026-64406

8.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock.

Published Jul 25, 2026EPSS 0.27%

Overview

CVE-2026-64406 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, 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:

Bluetooth: fix UAF in bt_accept_dequeue()

bt_accept_get() takes a temporary reference before dropping the accept

queue lock. bt_accept_dequeue() currently drops that reference before

bt_accept_unlink(), leaving only the queue reference.

bt_accept_unlink() drops the queue reference. The subsequent

sock_hold() therefore accesses freed memory if it was the final

reference, as observed by KASAN during listening L2CAP socket cleanup.

Retain the temporary queue-walk reference through unlink and hand it to

the caller on success. Drop it explicitly on the closed and

not-yet-connected paths.

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/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0Refgit.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614Refgit.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9aRefgit.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049Refgit.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1dbRefgit.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547Refgit.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8dRefgit.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64406?

CVE-2026-64406 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2026-64406?

This vulnerability has a CVSS 3.1 base score of 8.0, 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-2026-64406?

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-2026-64406?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64406 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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