{
  "cveId": "CVE-2026-99216",
  "url": "https://patchblox.com/security/cve/CVE-2026-99216",
  "summary": "CVE-2026-99216 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99216, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Drivers: hv: Don\u0027t reset VMBus connection state on error/exit paths",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Drivers: hv: Don\u0027t reset VMBus connection state on error/exit paths  In two places, current code forces vmbus_connection.conn_state to DISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect() calls vmbus_initiate_unload(), which unloads the VMBus connection only if the conn_state is CONNECTED. Consequently, the connection remains and the Hyper-V host might continue to send messages or post VMBus interrupts.  The problem was introduced in commit 74347a99e73ae (\u0022x86/Hyper-V: Unload vmbus channel in hv panic callback\u0022), in that vmbus_initiate_unload() started checking the current connection state before doing the unload. This commit removed some occurrences where conn_state was forced to DISCONNECTED, but these two remained, apparently due to an oversight at the time.  Fix this by not forcing conn_state to DISCONNECTED during VMBus exit, or if a failure occurs when establishing the connection in the first place. Whatever value conn_state has at the time is then read by vmbus_initiate_unload() to determine if there is a connection to be unloaded.",
  "published": "2026-10-28T11:17:43Z",
  "severity": "Moderate",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00137,
  "epssPercentile": 0.03128,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99216",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99216",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99216",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99216",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99216",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}