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CVE-2026-23461

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list…

Published Apr 3, 2026CWE-416EPSS 0.25%

Overview

CVE-2026-23461 is a high-severity vulnerability. It was published on April 3, 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: Fix use-after-free in l2cap_unregister_user

After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in

hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to

conn->users. However, l2cap_register_user() and l2cap_unregister_user()

don't use conn->lock, creating a race condition where these functions can

access conn->users and conn->hchan concurrently with l2cap_conn_del().

This can lead to use-after-free and list corruption bugs, as reported

by syzbot.

Fix this by changing l2cap_register_user() and l2cap_unregister_user()

to use conn->lock instead of hci_dev_lock(), ensuring consistent locking

for the l2cap_conn structure.

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/11a87dd5df428a4b79a84d2790cac7f3c73f1f0dRefgit.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8Refgit.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4aRefgit.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abfRefgit.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23461?

CVE-2026-23461 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-23461?

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-2026-23461?

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-2026-23461?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23461 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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