GHSA-FRW4-MRVX-H68W

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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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{
  "affected": [],
  "aliases": [
    "CVE-2026-68175"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:04Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix resource leak on mmiotrace trace_pipe close\n\nThe mmiotrace tracer was added May 12th 2008. At that time, resources\ncreated in pipe_open() could not be freed because there was not\npipe_close function pointer of the tracer. The pipe_close function pointer\nwas added in December 7th, 2009, but the mmiotrace tracer was not updated.\n\nmmio_pipe_open() allocates a header_iter and takes a pci_dev reference\nwhen trace_pipe is opened. mmio_close() frees them, but it was only\nwired to the tracer\u0027s .close callback.\n\ntracing_release_pipe() invokes .pipe_close, not .close, when the\ntrace_pipe file is released. As a result, closing trace_pipe with the\nmmiotrace tracer active leaked the header_iter allocation and left a\nstale pci_dev reference.\n\nSet .pipe_close to mmio_close, matching how function_graph wires both\ncallbacks to the same handler.\n\nNote, if the trace_pipe is read to completion, it will clean up the\nresources, but if one were to run:\n\n  # head -n 1 /sys/kernel/tracing/trace_pipe\n VERSION 20070824\n\nOver and over again, it would trigger a massive leak.",
  "id": "GHSA-frw4-mrvx-h68w",
  "modified": "2026-08-19T18:32:08Z",
  "published": "2026-08-10T15:33:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68175"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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