Bug 2467112 (CVE-2026-43134)

Summary: CVE-2026-43134 kernel: Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Bluetooth Low Energy (LE) Logical Link Control and Adaptation Protocol (L2CAP). A missing check for encryption key size when processing connection requests could allow a remote attacker to send a malformed request. This could lead to a protocol violation, potentially causing the system to enter an unexpected state or result in a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-06 13:04:55 UTC
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.