Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-01T00:00:00 kernel: Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-413

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt hci_conn lookup and field access must be covered by hdev lock in hci_le_remote_conn_param_req_evt, otherwise it's possible it is freed concurrently. Extend the hci_dev_lock critical section to cover all conn usage.

A flaw was found in the Linux kernel's Bluetooth component. This Use-After-Free (UAF) vulnerability arises from insufficient locking during `hci_conn` lookup and access within the `hci_le_remote_conn_param_req_evt` function. An attacker could potentially exploit this to cause a system crash or execute arbitrary code.

HCI LE remote connection parameter request event handling could UAF if connection state races teardown. Red Hat advises Bluetooth users to patch; unload `bluetooth` as operational workaround. To mitigate this issue, prevent the bluetooth module from being loaded. See https://access.redhat.com/solutions/41278 for instructions. Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-43018 https://nvd.nist.gov/vuln/detail/CVE-2026-43018 https://lore.kernel.org/linux-cve-announce/2026050157-CVE-2026-43018-b74a@gregkh/T