CVE-2026-80689

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions

mmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into

tr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map().

If these functions are invoked while mmio_trace_array is NULL (e.g. before

initialization or after disabled), accessing tr->array_buffer.buffer will

result in a NULL pointer dereference crash.

Fix this by adding an explicit NULL check for tr at the beginning of

__trace_mmiotrace_rw() and __trace_mmiotrace_map().

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References