CVE-2026-80525

Summary

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

ASoC: SOF: ipc4-topology: Refresh copier IPC payload before widget setup

The ipc_config_data buffer for copier widgets is built once during ipc_prepare (called from sof_pcm_setup_connected_widgets) and cached for reuse. For host copiers this buffer contains the copier_data with gtw_cfg.node_id (host DMA ID). For DAI copiers it additionally includes a dma_config_tlv trailer with stream_id and dma_channel_id for HDA link DMA.

On suspend/resume, both host and link DMA streams are released and re-allocated with potentially different stream tags. The underlying copier_data and dma_config_tlv structures are correctly updated by host_config and sdw_hda_dai_hw_params respectively. However, since the widget list (spcm->stream[].list) persists across suspend, sof_pcm_hw_params skips sof_pcm_setup_connected_widgets and ipc_prepare never runs again to rebuild ipc_config_data. The stale cached payload is then sent to firmware with boot-time DMA channel assignments, causing DMA channel conflicts that lead to firmware errors and crashes.

Fix this by refreshing copier_data and dma_config_tlv portions of ipc_config_data in sof_ipc4_widget_setup right before the IPC message is sent. This ensures the payload always reflects the current DMA state regardless of whether ipc_prepare ran.

For DAI copiers, the gtw_cfg.config_length in copier_data is temporarily inflated to include the TLV size (matching the ipc_config_data layout) before copying, then restored, mirroring what sof_ipc4_prepare_copier_module does when first building the buffer.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/decb87e76716d11d846c9c055e309c8ff90d7656
• https://git.kernel.org/stable/c/2a7d8fc0fd50e7a2020989d9840cabb74c0282e3
• https://git.kernel.org/stable/c/574498e56024082a0da68474ad4526d250732411
• https://git.kernel.org/stable/c/0c0e418dbcf0582bf80d8dbfd9b306607c065992

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