CVE-2026-89945

/// Technical description

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

ASoC: cs35l34: drain threaded IRQ before runtime suspend

cs35l34_runtime_suspend() currently switches the codec into

regcache_cache_only(true), asserts reset low, and powers the device off

without first quiescing the threaded IRQ registered by

devm_request_threaded_irq(). That leaves a window where

cs35l34_irq_thread() can still run after suspend has removed live

hardware 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..4 after cache_only has been

enabled, ignores the regmap_read() failures, and can still execute the

PROT_RELEASE_CTL release sequence or the BST fault power-down writes.

Use disable_irq() before entering cache_only/reset-low/power-off so any

in-flight threaded handler is drained and no new IRQ thread can run

while the device is suspended. Re-enable the IRQ onl

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References