CVE-2026-74738

CVE CVE-2026-74738EUVD EUVD-2026-66568Published 2026-08-26T14:36:51.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 6.18.46; 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 <6cf600b276a55a6481462830607a611f32e737c0; patch: 7.1.10; 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 <00268f9452d2a0d660aa9c1bb0ca07a994af6a4f; patch: 7.2; 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 <5bd8e897ecf558507142f4553e4526adfc1d6482; patch: 0; 6.14

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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