CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's ASoC subsystem, specifically the ipc_control_data buffer, which is susceptible to a heap overflow due to improper bounds checking in the bytes_ext_put and bytes_ext_get functions. This flaw allows unprivileged users to write beyond the allocated memory, potentially leading to arbitrary code execution or data corruption. Organizations using affected Linux kernel versions, particularly those implementing the ALSA TLV kcontrol interface, should prioritize patching this vulnerability to mitigate security risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get The ipc_control_data buffer is allocated as kzalloc(max_size), where max_size covers the entire struct sof_ipc_ctrl_data including its flexible array payload. However, the bounds checks in bytes_ext_put and _bytes_ext_get compared user data lengths against max_size directly, ignoring that cdata->data sits at an offset of sizeof(struct sof_ipc_ctrl_data) bytes into the allocation. This allowed writing up to sizeof(struct sof_ipc_ctrl_data) bytes past the end of the heap buffer from unprivileged userspace via the ALSA TLV kcontrol interface, and similarly allowed over-reading adjacent heap data on the get path. Fix all bounds checks to subtract sizeof(*cdata) from max_size so they reflect the actual space available at the cdata->data offset. Also fix the error-path restore in bytes_ext_put which wrote to cdata->data instead of cdata, causing the same overflow.