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CVE-2026-90256

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind hci_conn::l2cap_data is accessed without locks in l2ca…

Published Sep 17, 2026EPSS 0.38%

Overview

CVE-2026-90256 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via

hci_conn_timeout (disc_work) -> hci_proto_disconn_ind ->

l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted

concurrently.

disc_work is disabled sync in hci_conn_del(), so we cannot take

hci_dev_lock in disc_work.

Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock

which is held in other access 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/0fa448369c87e20b2aeaeaca0187d698dd61f791Refgit.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05Refgit.kernel.org/stable/c/7c032b6d48a46634cbd58aaebad2638c00ad3b51Refgit.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90256?

CVE-2026-90256 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-90256?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90256?

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-2026-90256?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90256 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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