{
  "cveId": "CVE-2026-80876",
  "url": "https://patchblox.com/security/cve/CVE-2026-80876",
  "summary": "CVE-2026-80876 is fixed in 56 products on 1 platform, first by ALAS2023-2026-2058, released August 17, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Fix event length with forced 8-byte...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Fix event length with forced 8-byte alignment  When RB_FORCE_8BYTE_ALIGNMENT is true, rb_calculate_event_length() reserves the space of event-\u003Earray[0] for placing the data length and rb_update_event() stores the data length in event-\u003Earray[0] accordingly. As a result the whole event length will add extra 4 bytes for sizeof(event.array[0]) unconditionally.  But ring_buffer_event_length() only subtracts the sizeof(event-\u003Earray[0]) for events larger than RB_MAX_SMALL_DATA \u002B sizeof(event-\u003Earray[0]). As a result, small events on architectures with RB_FORCE_8BYTE_ALIGNMENT=true report a data length that is 4 bytes larger than expected.  To fix it, add the RB_FORCE_8BYTE_ALIGNMENT as a condition to subtract the size of that length field whenever RB_FORCE_8BYTE_ALIGNMENT is true.  This issue is observed in a riscv64 kernel with CONFIG_HAVE_64BIT_ALIGNED_ACCESS set to y, when we run ftrace selftest trace_marker_raw.tc, we get the weird log: for cases where the id is 1..100, the number of data field is 8*N, but once id exceeds 100, the number of data field becomes 8*N\u002B4:  # 1 buf: 58 00 00 00 80 5e d1 63 (number of data field is 8*1)  ...  # a buf: 58 ...                  (number of data field is 8*2)  ...  # 64 buf: 58 ...                 (number of data field is 8*13)  # 65 buf: 58 ...                 (number of data field is 8*13\u002B4)  After applying this change, the number of data field keeps being 8*N\u002B4 consistently.",
  "published": "2026-08-17T09:00:00Z",
  "severity": "important",
  "epss": 0.0022,
  "epssPercentile": 0.12541,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2058",
      "released": "2026-08-17T09:00:00Z"
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      "fix": "ALAS2023-2026-2057",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2057",
      "released": "2026-08-17T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-2057",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2057",
      "released": "2026-08-17T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}