CVE-2026-80689 (GCVE-0-2026-80689)
Vulnerability from cvelistv5
Published
2026-08-28 06:52
Modified
2026-08-28 06:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions mmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into tr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map(). If these functions are invoked while mmio_trace_array is NULL (e.g. before initialization or after disabled), accessing tr->array_buffer.buffer will result in a NULL pointer dereference crash. Fix this by adding an explicit NULL check for tr at the beginning of __trace_mmiotrace_rw() and __trace_mmiotrace_map().
References
Impacted products
Vendor Product Version
Linux Linux Version: f984b51e0779a6dd30feedc41404013ca54e5d05
Version: f984b51e0779a6dd30feedc41404013ca54e5d05
Version: f984b51e0779a6dd30feedc41404013ca54e5d05
Version: f984b51e0779a6dd30feedc41404013ca54e5d05
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_mmiotrace.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions\n\nmmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into\ntr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map().\nIf these functions are invoked while mmio_trace_array is NULL (e.g. before\ninitialization or after disabled), accessing tr-\u003earray_buffer.buffer will\nresult in a NULL pointer dereference crash.\n\nFix this by adding an explicit NULL check for tr at the beginning of\n__trace_mmiotrace_rw() and __trace_mmiotrace_map()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:52:53.724Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2"
        }
      ],
      "title": "tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80689",
    "datePublished": "2026-08-28T06:52:53.724Z",
    "dateReserved": "2026-08-26T14:34:25.785Z",
    "dateUpdated": "2026-08-28T06:52:53.724Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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