CVE-2026-64408 Details
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.
A vulnerability in the Linux kernel's Bluetooth BNEP (Bluetooth Network Encapsulation Protocol) implementation has been addressed. The issue arose because the function handling BNEP connections did not properly manage synchronization when accessing L2CAP (Logical Link Control and Adaptation Protocol) connections. This oversight allowed for a race condition where the Bluetooth controller could release a connection while it was still being used, potentially leading to a use-after-free error. Specifically, during the registration of network devices, a freed parent device could be accessed, causing instability. The vulnerability has been fixed by ensuring that references to L2CAP connections are properly managed and synchronized, preventing concurrent modifications that could lead to errors.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version can be found in the Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944 | kernel.org | Patch |
| https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302 | kernel.org | Patch |
| https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc | kernel.org | Patch |
| https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da | kernel.org | Patch |
| https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31 | kernel.org | Patch |
| https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.13, < 5.10.261 >= 5.11, < 5.15.212 >= 5.16, < 6.1.178 >= 6.2, < 6.6.145 >= 6.7, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 7.2 rc1 7.2 rc2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |