An issue was discovered in the Linux kernel through 5.11.8. The sound/soc/qcom/sdm845.c soundwire device driver has a buffer overflow when an unexpected port ID number is encountered, aka CID-1c668e1c0a0f. (This has been fixed in 5.12-rc4.)
https://security.netapp.com/advisory/ntap-20210430-0003/
https://lore.kernel.org/alsa-devel/20210309142129.14182-2-srinivas.kandagatla%40linaro.org/