CVE-2026-89946

/// Technical 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 reg

/// 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