CVE-2026-64481: ALSA: hda/cs35l41: Fix firmware load work teardown

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

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

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

ALSA: hda/cs35l41: Fix firmware load work teardown

cs35l41_hda creates ALSA controls whose private data points at the
cs35l41_hda object. The firmware load control can also queue
fw_load_work.

Those controls are not removed on component unbind, and device remove
only cancels fw_load_work through cs35l41_remove_dsp(). That helper is
skipped when halo_initialized is false. With firmware_autostart
disabled, a firmware load can be requested before the DSP has been
initialized. If the component or device is removed before the queued
work runs, the worker can run after teardown and dereference driver
state that is no longer valid.

Track the created controls and remove them on unbind so no new control
callback can reach the driver data or queue more work. Then cancel
fw_load_work to drain any request that was already queued. Also cancel
the work unconditionally during device remove before runtime PM teardown.

The Linux kernel CVE team has assigned CVE-2026-64481 to this issue.


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

	Issue introduced in 6.0 with commit 47ceabd99a28399f8971f4ca0a37ebc0a21dd2a8 and fixed in 6.12.97 with commit 8947215c0136c9d905e4a46d824824f8b48a2e5b
	Issue introduced in 6.0 with commit 47ceabd99a28399f8971f4ca0a37ebc0a21dd2a8 and fixed in 6.18.39 with commit ce0a903d0591e3e2c790c5b628802b08d1b287cc
	Issue introduced in 6.0 with commit 47ceabd99a28399f8971f4ca0a37ebc0a21dd2a8 and fixed in 7.1.4 with commit d6a40a4d083ef74d00c8f9516cb5ff07ac70720b
	Issue introduced in 6.0 with commit 47ceabd99a28399f8971f4ca0a37ebc0a21dd2a8 and fixed in 7.2-rc1 with commit b65020d5398f499c09498c9786dba6d67ae57664

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-2026-64481
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:
	sound/hda/codecs/side-codecs/cs35l41_hda.c
	sound/hda/codecs/side-codecs/cs35l41_hda.h


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/8947215c0136c9d905e4a46d824824f8b48a2e5b
	https://git.kernel.org/stable/c/ce0a903d0591e3e2c790c5b628802b08d1b287cc
	https://git.kernel.org/stable/c/d6a40a4d083ef74d00c8f9516cb5ff07ac70720b
	https://git.kernel.org/stable/c/b65020d5398f499c09498c9786dba6d67ae57664