{
  "cveId": "CVE-2026-99159",
  "url": "https://patchblox.com/security/cve/CVE-2026-99159",
  "summary": "CVE-2026-99159 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99159, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Fix the sub-buffer array base in rb...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ring-buffer: Fix the sub-buffer array base in rb_meta_subbuf_idx()  On a persistent ring buffer, rb_meta_subbuf_idx() can return an index one sub-buffer too high.  rb_setup_ids_meta_page() then fills subbuf_ids[] shifted by one and leaves subbuf_ids[0] NULL, which __rb_map_vma() dereferences when userspace maps trace_pipe_raw.  rb_update_meta_reader() writes two such indices into meta-\u003Ebuffers[], which rb_cpu_meta_valid() would reject on the next boot, discarding the previous boot\u0027s trace.  A CPU\u0027s sub-buffer array starts after its meta header and the nr_subbufs integers that follow, aligned up to a sub-buffer.  rb_meta_subbuf_idx() inverts that calculation but skips only the integers, not the header, so its base is one sub-buffer low whenever the omitted header size crosses the alignment boundary.  Invert the calculation with rb_subbufs_from_meta() rather than repeating it.  rb_range_buffer() maps an index back to an address through the same helper, so the two directions can no longer disagree.",
  "published": "2026-10-28T11:17:36Z",
  "severity": "",
  "epss": 0.00176,
  "epssPercentile": 0.07148,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99159",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99159",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99159",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99159",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "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"
  }
}