CVE-2026-68392: Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync

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

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

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

Bluetooth: mgmt: fix locking in unpair_device/disconnect_sync

Dereferencing RCU-protected pointers outside critical sections is
invalid and may lead to UAF.

Take hdev->lock for hci_conn lookup and hci_abort_conn().  Don't use RCU
to ensure the conn is fully initialized at this point.

The Linux kernel CVE team has assigned CVE-2026-68392 to this issue.


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

	Issue introduced in 6.6.51 with commit 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c and fixed in 6.6.148 with commit 8bc83f9ef6789571f399ff631a2a14a12b6d8585
	Issue introduced in 6.11 with commit 227a0cdf4a028a73dc256d0f5144b4808d718893 and fixed in 6.12.101 with commit 579faba5ede6df6b7f36777c431dc8dcf9d272e7
	Issue introduced in 6.11 with commit 227a0cdf4a028a73dc256d0f5144b4808d718893 and fixed in 6.18.42 with commit ca58ad287bfc5b9d31a72ecb8650289df2b57250
	Issue introduced in 6.11 with commit 227a0cdf4a028a73dc256d0f5144b4808d718893 and fixed in 7.1.6 with commit b11511006f9e17000de3f4cadee451364f658ca3
	Issue introduced in 6.11 with commit 227a0cdf4a028a73dc256d0f5144b4808d718893 and fixed in 7.2-rc4 with commit 16cd66443957e4ad42155c6fec401012f600c6f8
	Issue introduced in 6.10.10 with commit 58afdc9b18871eb1d461c725be9e9f3f44a39aeb

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-2026-68392
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/mgmt.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/8bc83f9ef6789571f399ff631a2a14a12b6d8585
	https://git.kernel.org/stable/c/579faba5ede6df6b7f36777c431dc8dcf9d272e7
	https://git.kernel.org/stable/c/ca58ad287bfc5b9d31a72ecb8650289df2b57250
	https://git.kernel.org/stable/c/b11511006f9e17000de3f4cadee451364f658ca3
	https://git.kernel.org/stable/c/16cd66443957e4ad42155c6fec401012f600c6f8