{
  "cveId": "CVE-2026-89571",
  "url": "https://patchblox.com/security/cve/CVE-2026-89571",
  "summary": "CVE-2026-89571 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89571 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  cxl/features: bound fwctl command payload to the...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  cxl/features: bound fwctl command payload to the input buffer  fwctl_cmd_rpc() copies cmd-\u003Ein_len bytes into inbuf = kvzalloc(cmd-\u003Ein_len) and passes inbuf and in_len to -\u003Efw_rpc(). The CXL callback cxlctl_fw_rpc() ignores in_len and never checks the user-controlled op_size against it.  cxlctl_set_feature() bounds op_size only from below (op_size \u003C= sizeof(feat_in-\u003Ehdr)) and then reads op_size - sizeof(hdr) bytes from feat_in-\u003Efeat_data via cxl_set_feature(). With a small in_len and a large op_size the first memcpy() already reads past the kvzalloc(in_len) buffer; the out-of-bounds bytes are placed in the mailbox payload and sent to the device, and a large enough op_size can walk into unmapped memory and oops the kernel. The Get paths pin op_size to a fixed size but likewise read the input struct without checking in_len.  Reject, at the single dispatch point, any request whose fixed header plus op_size does not fit in the copied-in buffer. The lower-bound test guards the subtraction and ensures op_size was copied in before it is read.",
  "published": "2026-09-11T20:19:41Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00164,
  "epssPercentile": 0.0565,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89571",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89571",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "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"
  }
}