CVE-2026-74541: Bluetooth: ISO: clear iso_data always when detaching conn from hcon

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

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

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

Bluetooth: ISO: clear iso_data always when detaching conn from hcon

When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is
necessary, otherwise later iso_conn_free() will UAF.

Fix clearing of iso_data in iso_sock_disconn()

Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on
iso_sock_release() followed by hci_abort_conn_sync().

The Linux kernel CVE team has assigned CVE-2026-74541 to this issue.


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

	Issue introduced in 6.6 with commit fbdc4bc47268953c80853489f696e02d61f9a2c6 and fixed in 6.6.151 with commit cc1d39946d62bc568551dfb81149724de1e91338
	Issue introduced in 6.6 with commit fbdc4bc47268953c80853489f696e02d61f9a2c6 and fixed in 6.12.103 with commit 7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0
	Issue introduced in 6.6 with commit fbdc4bc47268953c80853489f696e02d61f9a2c6 and fixed in 6.18.44 with commit 63c0f396a18b767eb28e895eb95bbdce6c172c59
	Issue introduced in 6.6 with commit fbdc4bc47268953c80853489f696e02d61f9a2c6 and fixed in 7.1.8 with commit 69a4a7b162b3db6ac337e3094cdee38f24d42ff7
	Issue introduced in 6.6 with commit fbdc4bc47268953c80853489f696e02d61f9a2c6 and fixed in 7.2-rc6 with commit d57e506f6a1e3929611340fae87c1e4823f4d85c
	Issue introduced in 6.5.12 with commit c03a10bd5b6ccb22921e04bcddc987410df7e7a9

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-2026-74541
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/iso.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/cc1d39946d62bc568551dfb81149724de1e91338
	https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0
	https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59
	https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7
	https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c