{
  "cveId": "CVE-2026-89968",
  "url": "https://patchblox.com/security/cve/CVE-2026-89968",
  "summary": "CVE-2026-89968 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2026-89968, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nvmet-tcp: reject unsolicited H2CData PDUs",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nvmet-tcp: reject unsolicited H2CData PDUs  nvmet_tcp_handle_h2c_data_pdu() accepts an H2CData PDU after only checking that its TTAG is a valid in-range command index and that the command\u0027s data buffers are mapped. It never checks that the target has actually solicited that data by sending an R2T for the command.  A remote host can abuse this. It submits a write command that takes the R2T path and, before the target transmits the R2T, sends an H2CData PDU for that command\u0027s tag. The data completes the command early, and when the command then fails synchronously (e.g. a length mismatch caught by nvmet_check_transfer_len()), it is completed a second time. Each completion calls nvmet_tcp_queue_response(), so the same command is added to queue-\u003Eresp_list twice while it is still linked; the second llist_add() makes the node point to itself (lentry-\u003Enext == lentry).  nvmet_tcp_process_resp_list() then walks that self-referential node and adds the command to resp_send_list twice. With CONFIG_DEBUG_LIST this trips the \u0022list_add double add\u0022 check (kernel BUG); without it the loop never terminates and the nvmet_tcp workqueue wedges (soft-lockup). It is remotely triggerable and needs no authentication on an allow_any_host subsystem.  Track whether an R2T has been transmitted for a command and reject an H2CData PDU that arrives before it. The flag is cleared on command reuse (nvmet_tcp_get_cmd() zeroes cmd-\u003Eflags) and stays set across the multiple H2CData PDUs of a single solicited transfer.",
  "published": "2026-09-16T11:17:07Z",
  "severity": "Moderate",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0082,
  "epssPercentile": 0.57475,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89968",
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  "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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}