CVE-2026-89946: ASoC: cs35l33: drain threaded IRQ before runtime suspend

CVE-2026-89946: ASoC: cs35l33: drain threaded IRQ before runtime suspend

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

ASoC: cs35l33: drain threaded IRQ before runtime suspend

cs35l33_runtime_suspend() currently switches the codec into
regcache_cache_only(true) and powers it down without first quiescing the
threaded IRQ registered by devm_request_threaded_irq(). That leaves a
window where cs35l33_irq_thread() can still run after suspend has closed
off live register access.

A running system can reach this during runtime PM while the driver still
has critical fault IRQs unmasked. If the threaded handler runs in that
window, it reads volatile INT_STATUS_1/2 after cache_only has been
enabled, ignores the regmap_read() failures, and can still drive the
AMP_SHORT_RLS, CAL_ERR_RLS, OTE_RLS, and OTW_RLS release paths.

Use disable_irq() before entering cache_only/power-off so any in-flight
threaded handler is drained and no new IRQ thread can run during the
suspended state. Re-enable the IRQ only after runtime_resume() has
restored live register access with regcache_sync(). Since probe only
warns if devm_request_threaded_irq() fails, track whether the IRQ was
actually installed before disabling or re-enabling it.

The Linux kernel CVE team has assigned CVE-2026-89946 to this issue.


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

	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 5.10.270 with commit d07799302721d381aef834fac8a11d196894eccb
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 5.15.221 with commit 5b5311427e54d9c0d07178ee42df68ba44c2d5ca
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 6.1.188 with commit a04722542c76ce861031384480825afded8cc4f4
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 6.6.157 with commit 614c2616ea677abfbed917a92bdc5141efff3536
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 6.12.110 with commit 6ae98918240585eb2ad32b097c4810f4e2dabe88
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 6.18.51 with commit 6e369bc46663b4bfce3d5f8b8ed08e71ecea13a2
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 7.2.5 with commit 84cf6acd01a1ec8f30276578a039216327af782e
	Issue introduced in 4.8 with commit 3333cb7187b9c8d28f7a6405bbe9cec7a10efdc8 and fixed in 7.3-rc1 with commit e074c12c428c633e079154301207a6079a208583

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-2026-89946
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/soc/codecs/cs35l33.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/d07799302721d381aef834fac8a11d196894eccb
	https://git.kernel.org/stable/c/5b5311427e54d9c0d07178ee42df68ba44c2d5ca
	https://git.kernel.org/stable/c/a04722542c76ce861031384480825afded8cc4f4
	https://git.kernel.org/stable/c/614c2616ea677abfbed917a92bdc5141efff3536
	https://git.kernel.org/stable/c/6ae98918240585eb2ad32b097c4810f4e2dabe88
	https://git.kernel.org/stable/c/6e369bc46663b4bfce3d5f8b8ed08e71ecea13a2
	https://git.kernel.org/stable/c/84cf6acd01a1ec8f30276578a039216327af782e
	https://git.kernel.org/stable/c/e074c12c428c633e079154301207a6079a208583