Linux Kernel Tracing: Concurrency Issue in trace_types_lock Handling
CVE-2026-99237 Published on November 2, 2026
tracing: Hold trace_types_lock when resetting last boot data from readers
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.
Products Associated with CVE-2026-99237
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Affected Versions
Linux:- Version 32dc0042528d385d83bf458e4cf3a49c5110afea and below 92b69f6db640dadc0851762ee2e12db99f083cad is affected.
- Version 32dc0042528d385d83bf458e4cf3a49c5110afea and below d6d991afe775ab7fcf89523a2502b7ca3be56ffd is affected.
- Version 32dc0042528d385d83bf458e4cf3a49c5110afea and below 1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa is affected.
- Version 6.16 is affected.
- Before 6.16 is unaffected.
- Version 6.18.60, <= 6.18.* is unaffected.
- Version 7.2.14, <= 7.2.* is unaffected.
- Version 7.3.1, <= 7.3.* is unaffected.