CVE-2026-99237tracing: Hold trace_types_lock when resetting last boot data from readers

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Hold trace_types_lock when resetting last boot data from readers update_last_data_if_empty() is called from tracing_open() with O_TRUNC, tracing_read_pipe() and tracing_buffers_read() without trace_types_lock. Two readers can both pass the LAST_BOOT test and free module_delta twice, and a module notifier can update module_delta while it is being freed. Take trace_types_lock in those paths and keep the callers that already hold it on an unlocked variant.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad
• https://git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd
• https://git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa
• https://git.kernel.org/stable/c/5a6bd62f09147b49b31fd19d4eba122cb5f941a1