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CVE-2026-74540

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but…

Published Aug 15, 2026EPSS 0.26%

Overview

CVE-2026-74540 is a high-severity vulnerability. It was published on August 15, 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 UAF in l2cap_le_connect_rsp

l2cap_le_connect_rsp() obtains a channel via

__l2cap_get_chan_by_ident() but neither holds a reference nor uses

l2cap_chan_hold_unless_zero() before locking and operating on it.

A concurrent l2cap_chan_del() triggered by a remote disconnect can

free the channel between the lookup and l2cap_chan_lock(), causing

a use-after-free.

The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler

l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero()

to safely hold a reference, but l2cap_le_connect_rsp() was left

unprotected.

Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup

and l2cap_chan_put() on the exit path, consistent with other L2CAP

response handlers.

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/09f447accc2570751e7d17f0dc0788b40d3edadeRefgit.kernel.org/stable/c/15d6c2367217a6a20b1abae9f38ded716bf620f1Refgit.kernel.org/stable/c/1818180fe12d6cec7a437bc59cde8efdf6b10250Refgit.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830dRefgit.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136Refgit.kernel.org/stable/c/8325eafb38c3dee5af329266393763693d17381bRefgit.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69dRefgit.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74540?

CVE-2026-74540 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-74540?

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-2026-74540?

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-2026-74540?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74540 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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