{
  "cveId": "CVE-2025-40223",
  "url": "https://patchblox.com/security/cve/CVE-2025-40223",
  "summary": "CVE-2025-40223 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2025-40223, released December 4, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "most: usb: Fix use-after-free in hdm_disconnect",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  most: usb: Fix use-after-free in hdm_disconnect  hdm_disconnect() calls most_deregister_interface(), which eventually unregisters the MOST interface device with device_unregister(iface-\u003Edev). If that drops the last reference, the device core may call release_mdev() immediately while hdm_disconnect() is still executing.  The old code also freed several mdev-owned allocations in hdm_disconnect() and then performed additional put_device() calls. Depending on refcount order, this could lead to use-after-free or double-free when release_mdev() ran (or when unregister paths also performed puts).  Fix by moving the frees of mdev-owned allocations into release_mdev(), so they happen exactly once when the device is truly released, and by dropping the extra put_device() calls in hdm_disconnect() that are redundant after device_unregister() and most_deregister_interface().  This addresses the KASAN slab-use-after-free reported by syzbot in hdm_disconnect(). See report and stack traces in the bug link below.",
  "published": "2025-12-04T16:16:14Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.0022,
  "epssPercentile": 0.12572,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40223",
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  "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"
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}