CVE-2026-97617 (GCVE-0-2026-97617)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check resize_disabled before publishing the new subbuf order ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA. Check the CPUs before storing the new order.
References
Impacted products
Vendor Product Version
Linux Linux Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
Version: 117c39200d9d760cbd5944bb89efb7b9c51965aa
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ring_buffer.c"
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          "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\nring-buffer: Check resize_disabled before publishing the new subbuf order\n\nring_buffer_subbuf_order_set() stores the new order and only then walks\nthe CPUs, returning -EBUSY if any of them has resizing disabled. A user\nmapped buffer has resizing disabled, and __rb_map_vma() reads\nbuffer-\u003esubbuf_order without buffer-\u003emutex, so an mmap of an already\nmapped CPU racing the failing order change sizes the mapping with the\nnew order and inserts pages past the sub-buffer into the VMA.\n\nCheck the CPUs before storing the new order."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:10:20.808Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f2099644e1b2a2c0805c5240d63ab0522d9d0174"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d860c67c051685abb0460b593b193f0f45f4fa92"
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      "title": "ring-buffer: Check resize_disabled before publishing the new subbuf order",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97617",
    "datePublished": "2026-09-25T10:22:24.436Z",
    "dateReserved": "2026-09-24T16:01:01.159Z",
    "dateUpdated": "2026-10-19T09:10:20.808Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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