CVE-2026-93184
UnknownSummary
In the Linux kernel, the ASoC fsl_audmix component leaves the AUDMIX block powered off and suspended after pm_runtime_enable() until the first runtime resume. Register writes issued between probe() and the first resume target unpowered hardware and cause a system hang.
Risk Assessment
Accessing DAPM or ALSA control paths before the first resume can hang the entire system. It requires a hardware configuration with AUDMIX.
Recommendation
Update the Linux kernel to a version containing the fix that calls pm_runtime_resume_and_get() right after pm_runtime_enable() and handles the CONFIG_PM-disabled case. Avoid accessing audio controls before hardware initialization.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ASoC: fsl_audmix: rework runtime PM handling in probe After pm_runtime_enable() the AUDMIX block is powered off and stays suspended until the first runtime resume. Register writes issued between probe() and the first resume (e.g. from DAPM or ALSA control paths) target unpowered hardware and cause a system hang. Fix this by calling pm_runtime_resume_and_get() immediately after pm_runtime_enable() to power the hardware up and enable its clocks. Release the reference afterwards with pm_runtime_put() to allow the runtime PM framework to suspend the device and switch the regmap to cache-only mode when idle. When CONFIG_PM is disabled or runtime PM is not enabled, pm_runtime_* calls are stubs that do not power up the hardware. Handle this case explicitly by calling fsl_audmix_runtime_resume() directly so the hardware is always initialised and its clocks are enabled, ensuring register accesses succeed regardless of PM configuration.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS