CVE-2026-74738

CVE-2026-74738 affects the Linux kernel regmap sdw-mbq (SoundWire Modem Bus Queued) subsystem. The function regmap_sdw_mbq_poll_busy() dereferences ctx->readable_reg() without checking for NULL , but this callback is optional—drivers such as es9356 and tac5xx2-sdw build an MBQ regmap without s...