{
  "cveId": "CVE-2026-46064",
  "url": "https://patchblox.com/security/cve/CVE-2026-46064",
  "summary": "CVE-2026-46064 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-46064, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ibmasm: fix heap over-read in ibmasm_send_i2o_message()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ibmasm: fix heap over-read in ibmasm_send_i2o_message()  The ibmasm_send_i2o_message() function uses get_dot_command_size() to compute the byte count for memcpy_toio(), but this value is derived from user-controlled fields in the dot_command_header (command_size: u8, data_size: u16) and is never validated against the actual allocation size. A root user can write a small buffer with inflated header fields, causing memcpy_toio() to read up to ~65 KB past the end of the allocation into adjacent kernel heap, which is then forwarded to the service processor over MMIO.  Silently clamping the copy size is not sufficient: if the header fields claim a larger size than the buffer, the SP receives a dot command whose own header is inconsistent with the I2O message length, which can cause the SP to desynchronize. Reject such commands outright by returning failure.  Validate command_size before calling get_mfa_inbound() to avoid leaking an I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware frame from the controller\u0027s free pool, and returning without a corresponding set_mfa_inbound() call would permanently exhaust it.  Additionally, clamp command_size to I2O_COMMAND_SIZE before the memcpy_toio() so the MMIO write stays within the I2O message frame, consistent with the clamping already performed by outgoing_message_size() for the header field.",
  "published": "2026-05-27T14:17:26Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00142,
  "epssPercentile": 0.03513,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46064",
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  "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"
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}