CVE-2026-43134 Details
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ This adds a check for encryption key size upon receiving L2CAP_LE_CONN_REQ which is required by L2CAP/LE/CFC/BV-15-C which expects L2CAP_CR_LE_BAD_KEY_SIZE.
A vulnerability in the Linux kernel's Bluetooth implementation has been addressed. The issue involved a missing encryption key size check in the L2CAP (Logical Link Control and Adaptation Protocol) layer for Low Energy (LE) connection requests. This oversight could lead to improper handling of connection requests, as the L2CAP layer requires a specific key size for secure communications. The vulnerability was present in the stable version of the Linux kernel.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
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/138d7eca445ef37a0333425d269ee59900ca1104 | kernel.org | Patch |
| https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecef | kernel.org | Patch |
| https://git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ec91078e132179b04e0c3906b599816c056ceaad | kernel.org | Patch |
| https://git.kernel.org/stable/c/fa6ad76fa8623c0a50d529cd5726fa5d819a3be4 | 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 | >= 3.14, < 5.10.252 >= 5.11, < 5.15.202 >= 5.16, < 6.1.165 >= 6.2, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 7.0 rc1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 12, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | CVE Modified | kernel.org |
| May 6, 2026 | New CVE Received | kernel.org |