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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68175

tracing: Fix resource leak on mmiotrace trace_pipe close

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Status
Published
Published
Updated
Assigning organization
Linux

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, 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < 7871128ea41217fa6a58bbbcb44cb0d2e9e60966affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < 1d0b59e2b203c02149d8f63607329debe36b3ec5affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < 581ac13e12e77d6c64f8719083bdf95209308919affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < f9e6dfe341fb31c95b9655eb6b1db8b3ae090817affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < 594e1cf3f736779a535873fd5988162d827bfe4faffected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < cf5a82bef623b969a609f2b7e392d06dbae34aa6affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < cb459fec4f7b13caf646101ff076e94ef38434d8affected
  • c521efd1700a8c0f7ce26f011f5eaecca17fabfa to < c1d87e724ae55e781b7cc7ccafb34d9e668582b2affected

Linux Linux

Default version status: affected

  • 2.6.33affected
  • 0 to < 2.6.33unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.148 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References