tracing: Fix resource leak on mmiotrace trace_pipe close

{
  "id": "a025d0e5f42cdef283474adc601f62417c0659d870aefbc27cf432d6c8daf875",
  "url": "https://osv.dev/vulnerability/CVE-2026-68175",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tracing: Fix resource leak on mmiotrace trace_pipe close",
    "summary": "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.",
    "evidence": "osv:CVE-2026-68175",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.183",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.101",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68175",
      "aliases": [
        "CVE-2026-68175"
      ],
      "affected": [
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                  "fixed": "1d0b59e2b203c02149d8f63607329debe36b3ec5"
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                {
                  "fixed": "581ac13e12e77d6c64f8719083bdf95209308919"
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                  "fixed": "f9e6dfe341fb31c95b9655eb6b1db8b3ae090817"
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              "type": "ECOSYSTEM",
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          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:26.269294062Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5",
        "https://git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919",
        "https://git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f",
        "https://git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966",
        "https://git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2",
        "https://git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8",
        "https://git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6",
        "https://git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68175.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68175",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68175.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68175",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493021,
  "published_at": "2026-08-10T11:59:45.965+00:00"
}