CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's ASoC subsystem, specifically within the Qualcomm q6apm driver, where a NULL pointer dereference can occur due to a race condition during buffer management. This can lead to crashes when dereferencing a freed buffer, potentially disrupting system stability. Organizations using affected Linux kernel versions, particularly those leveraging Qualcomm DSPs, should prioritize patching to mitigate this risk.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: ASoC: qcom: q6apm: fix NULL pointer dereference in graph_callback When q6apm_free_fragments() is called it frees rx_data.buf/tx_data.buf and sets them to NULL under graph->lock. A late DSP buffer-done response can race with this: graph_callback() passes the !graph->ar_graph guard (not yet NULL), acquires the lock, but then dereferences a now-NULL buf pointer to read buf[token].phys, crashing at virtual address 0x10. Add a NULL check for buf inside the mutex-protected section in both the write-done (DATA_CMD_RSP_WR_SH_MEM_EP_DATA_BUFFER_DONE_V2) and read-done (DATA_CMD_RSP_RD_SH_MEM_EP_DATA_BUFFER_V2) handlers and bail out cleanly if buffers have already been freed. This problem is only shown up recently while apr bus was updated to process the commands per service rather from single global queue.