CVE-2026-68390: Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups

hci_conn_params_lookup requires hdev->lock be held, otherwise the list
iteration or param access is not safe.

Hold hdev->lock for params lookups in hci_sync.

The Linux kernel CVE team has assigned CVE-2026-68390 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.19 with commit c530569adc19b5f0c62955de41f067bad34e3fe0 and fixed in 7.1.6 with commit 8d892bec1dd134761cabec6ba23fe315d0f20f98
	Issue introduced in 6.19 with commit c530569adc19b5f0c62955de41f067bad34e3fe0 and fixed in 7.2-rc4 with commit c363202ec841df36421ec280eea3d5f94f556143

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68390
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/bluetooth/hci_sync.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/8d892bec1dd134761cabec6ba23fe315d0f20f98
	https://git.kernel.org/stable/c/c363202ec841df36421ec280eea3d5f94f556143