CVE-2026-43134

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.

Red Hat acknowledges the upstream Linux kernel correction for «Bluetooth» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the bluetooth module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.