CVE-2026-68175 in Linux
الملخص
بحسب MITRE • 10/08/2026
In the Linux kernel, the following vulnerability has been resolved:
tracing: Fix resource leak on mmiotrace trace_pipe close
The mmiotrace tracer was added May 12th 2008. At that time, resources created in pipe_open() could not be freed because there was not pipe_close function pointer of the tracer. The pipe_close function pointer was added in December 7th, 2009, but the mmiotrace tracer was not updated.
mmio_pipe_open() allocates a header_iter and takes a pci_dev reference when trace_pipe is opened. mmio_close() frees them, but it was only wired to the tracer's .close callback.
tracing_release_pipe() invokes .pipe_close, not .close, when the trace_pipe file is released. As a result, closing trace_pipe with the mmiotrace tracer active leaked the header_iter allocation and left a stale pci_dev reference.
Set .pipe_close to mmio_close, matching how function_graph wires both callbacks to the same handler.
Note, if the trace_pipe is read to completion, it will clean up the resources, but if one were to run:
# head -n 1 /sys/kernel/tracing/trace_pipe VERSION 20070824
Over and over again, it would trigger a massive leak.
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