Null Pointer Dereference in Linux Kernel Logging Functions

CVE-2026-80689

What is CVE-2026-80689?

A vulnerability has been identified in the Linux kernel’s tracing subsystem, specifically within the mmio_trace_rw() and mmio_trace_mapping() functions. These functions can lead to a NULL pointer dereference crash if invoked while the mmio_trace_array is uninitialized or has been disabled. This issue has been addressed by implementing a NULL check at the start of critical logging functions, ensuring that the kernel behaves reliably under these conditions.

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