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CVE-2026-90093

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: access chan->conn safely in get/setsockopt Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel t…

Published Sep 17, 2026EPSS 0.18%

Overview

CVE-2026-90093 is a high-severity vulnerability. It was published on September 17, 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:

Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref")

l2cap_chan::conn has held reference and remains non-NULL also after the

corresponding hci_conn is deleted. In this state accessing various

fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in

l2cap_sock_setsockopt() access of conn->hcon->hdev.

Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before

trying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in

getsockopt/setsockopt to ensure it stays alive, and to avoid data races

in l2cap_chan fields.

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/0d7b7b31ea092e17d757bd24e2e9028ba5e3a4caRefgit.kernel.org/stable/c/19e154d794eb4d33d99ca4a087b1cea9d5e65786Refgit.kernel.org/stable/c/3af72bf8f73c519ee562e6963d5ff8e678924f93Refgit.kernel.org/stable/c/737b80c97aef10404a9beed7c0ed45fcd5fc5931Refgit.kernel.org/stable/c/8460dc49c9756a1e9288218060b4d41e1b704905Refgit.kernel.org/stable/c/c66cd500ba1a58b3798c468fcc774ed2c8c2ec7dRefgit.kernel.org/stable/c/ca2c4c26498643f421d35ffe258fafbd3ed461c3Refgit.kernel.org/stable/c/f49321c85785178214fd67f2e9b4b73d6363783b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90093?

CVE-2026-90093 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90093?

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-2026-90093?

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-2026-90093?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90093 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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