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CVE-2026-64128

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: drop ISO_END frames received without prior ISO_START ISO data PDUs carry a packet-boundary flag indicating STAR…

Published Jul 19, 2026CWE-476EPSS 0.13%

Overview

CVE-2026-64128 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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: ISO: drop ISO_END frames received without prior ISO_START

ISO data PDUs carry a packet-boundary flag indicating START, CONT, END

or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing

ISO_START by checking conn->rx_len before touching conn->rx_skb, but

ISO_END does not.

If a peer sends an ISO_END as the first packet on a fresh ISO

connection, conn->rx_skb is still NULL and conn->rx_len is zero, so

skb_put(conn->rx_skb, ...) dereferences NULL and oopses. For BIS,

where receivers sync to a broadcaster without pairing, any broadcaster

on the air can trigger this.

Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment

is logged and dropped instead of crashing the host.

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/1c3d1e1696b72579b970e17999c503a14535205bRefgit.kernel.org/stable/c/39f4a82e80c8f5ed2d6952d73fbafc895721a728Refgit.kernel.org/stable/c/3af41ee7ebecb0d5c8a504861f6cfad31345310fRefgit.kernel.org/stable/c/61f2410a96dee808029e2ae4d6ef2dd635f3477fRefgit.kernel.org/stable/c/84c24fb151fc1179355296d7ff29129ac7c42129Refgit.kernel.org/stable/c/e3a799881c12d27596232636a607e2e3fa448d63

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64128?

CVE-2026-64128 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-64128?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64128?

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-2026-64128?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64128 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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