Audio Playback Issue in Thundercomm Dragonboard 845c Due to Linux Kernel Vulnerability

CVE-2025-40317

What is CVE-2025-40317?

In the Linux kernel, an improper bus_context pointer in the regmap initialization for the slimbus bus can lead to kernel paging requests, notably disrupting audio playback on the Thundercomm Dragonboard 845c. This vulnerability was identified in commits that altered how the slimbus regmap is handled, specifically affecting the wcd934x codec. The issue arises from the transition to using __devm_regmap_init_slimbus() instead of __regmap_init_slimbus(), resulting in an incorrect pointer being utilized during initialization. Addressing this vulnerability involves correcting the bus_context pointer to ensure proper functionality and prevent playback failures.

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