Description
In the Linux kernel, the following vulnerability has been resolved:
regmap: sdw-mbq: don't call an unset readable_reg callback
regmap_sdw_mbq_poll_busy() decides whether to poll the Function Busy bit by calling ctx->readable_reg(), which is a straight copy of config->readable_reg. That callback is optional: regmap_readable() treats a NULL ->readable_reg as "every register is readable", and drivers rely on that. es9356 and tac5xx2-sdw both build an MBQ regmap without one.
Since commit ca1b11b36d82 ("regmap: sdw-mbq: Allow defers on undeferrable controls") the poll runs on every -ENODATA, not only for Controls the driver marked deferrable, so any of those devices answering COMMAND_IGNORED takes the kernel through a NULL function pointer.
Treat a missing callback the way the rest of regmap does and poll.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69, < 6cf600b276a55a6481462830607a611f32e737c0; >= 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69, < 5bd8e897ecf558507142f4553e4526adfc1d6482; >= 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69, < 00268f9452d2a0d660aa9c1bb0ca07a994af6a4f |
| Linux | Linux | 6.14 |
References
Timeline
- Published
- Aug 26, 2026
- Last modified
- Aug 26, 2026
- NVD status
- Received