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CVE-2026-53208

kernel: Bluetooth: L2CAP: reject BR/EDR signaling packets over MTUsig

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · June 25, 2026

Updated · July 3, 2026

Description

A flaw was found in the Linux kernel's Bluetooth subsystem. A remote attacker within radio range, before pairing, can send specially crafted Bluetooth BR/EDR (Basic Rate/Enhanced Data Rate) signaling packets that exceed the maximum transmission unit (MTU) for signaling. This improper handling of oversized packets can force the target device to transmit numerous response frames, leading to a denial of service (DoS) by consuming system resources.

CVSS score applicability

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.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-1284 · Improper Validation of Specified Quantity in Input