CVE-2026-68175

Technical Description

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

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