CVE-2026-74738: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 преди 6cf600b276a55a6481462830607a611f32e737c0; 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 преди 5bd8e897ecf558507142f4553e4526adfc1d6482; 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 преди 00268f9452d2a0d660aa9c1bb0ca07a994af6a4f
• Linux Linux: 6.14; преди 6.14; 6.18.46 до 6.18.*; 7.1.10 до 7.1.*; от 7.2 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-74738
• https://nvd.nist.gov/vuln/detail/CVE-2026-74738
• https://git.kernel.org/stable/c/6cf600b276a55a6481462830607a611f32e737c0
• https://git.kernel.org/stable/c/5bd8e897ecf558507142f4553e4526adfc1d6482
• https://git.kernel.org/stable/c/00268f9452d2a0d660aa9c1bb0ca07a994af6a4f