CVE-2026-99158 (GCVE-0-2026-99158)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-28 10:35
VLAI
Title
ring-buffer: Fix false warning in ring_buffer_map_get_reader()
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix false warning in ring_buffer_map_get_reader() The mmap reader can warn when it catches up with a writer that is still committing events. rb_get_reader_page() returns NULL in this case, but ring_buffer_map_get_reader() treats that result as an error. The initial rb_per_cpu_empty() check filters out an empty buffer, but it does not guarantee that the next reader page has committed data. Writers do not take reader_lock and can advance commit_page before publishing the committed length on the new page. rb_get_reader_page() can swap to that page, catch up with the writer and return NULL. Handle NULL through the existing no-data exit without warning. Remove the caller's reader_page == commit_page check as well, since the reader-page helper already handles that case. The existing metadata update and return path remain in place.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < 029770f5badedc0f0ff85fc45e24785cbbee4a67 (git)
Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438 (git)
Affected: 117c39200d9d760cbd5944bb89efb7b9c51965aa , < 89bab1dba8a0167ef0d819e0f55b6bafa038e87f (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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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: Fix false warning in ring_buffer_map_get_reader()\n\nThe mmap reader can warn when it catches up with a writer that is still\ncommitting events. rb_get_reader_page() returns NULL in this case, but\nring_buffer_map_get_reader() treats that result as an error.\n\nThe initial rb_per_cpu_empty() check filters out an empty buffer, but it\ndoes not guarantee that the next reader page has committed data. Writers\ndo not take reader_lock and can advance commit_page before publishing the\ncommitted length on the new page. rb_get_reader_page() can swap to that\npage, catch up with the writer and return NULL.\n\nHandle NULL through the existing no-data exit without warning. Remove the\ncaller\u0027s reader_page == commit_page check as well, since the reader-page\nhelper already handles that case. The existing metadata update and return\npath remain in place."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:35:11.848Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/029770f5badedc0f0ff85fc45e24785cbbee4a67"
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          "url": "https://git.kernel.org/stable/c/68e6ab180cfb6dfa79652f41ed7899a6d4cf5438"
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        {
          "url": "https://git.kernel.org/stable/c/89bab1dba8a0167ef0d819e0f55b6bafa038e87f"
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      "title": "ring-buffer: Fix false warning in ring_buffer_map_get_reader()",
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  "cveMetadata": {
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    "cveId": "CVE-2026-99158",
    "datePublished": "2026-10-28T10:35:11.848Z",
    "dateReserved": "2026-09-25T10:25:14.397Z",
    "dateUpdated": "2026-10-28T10:35:11.848Z",
    "state": "PUBLISHED"
  },
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix false warning in ring_buffer_map_get_reader()\n\nThe mmap reader can warn when it catches up with a writer that is still\ncommitting events. rb_get_reader_page() returns NULL in this case, but\nring_buffer_map_get_reader() treats that result as an error.\n\nThe initial rb_per_cpu_empty() check filters out an empty buffer, but it\ndoes not guarantee that the next reader page has committed data. Writers\ndo not take reader_lock and can advance commit_page before publishing the\ncommitted length on the new page. rb_get_reader_page() can swap to that\npage, catch up with the writer and return NULL.\n\nHandle NULL through the existing no-data exit without warning. Remove the\ncaller\u0027s reader_page == commit_page check as well, since the reader-page\nhelper already handles that case. The existing metadata update and return\npath remain in place."
          }
        ],
        "id": "CVE-2026-99158",
        "lastModified": "2026-10-28T11:17:36.050",
        "metrics": {},
        "published": "2026-10-28T11:17:36.050",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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