{
  "cveId": "CVE-2025-21704",
  "url": "https://patchblox.com/security/cve/CVE-2025-21704",
  "summary": "CVE-2025-21704 is fixed in 82 products on 1 platform, first by DEBIAN-CVE-2025-21704, released February 22, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  usb: cdc-acm: Check control transfer buffer size...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  usb: cdc-acm: Check control transfer buffer size before access  If the first fragment is shorter than struct usb_cdc_notification, we can\u0027t calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing \u0060expected_size - acm-\u003Enb_index\u0060 to wrap.  This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 (\u0022cdc-acm: reassemble fragmented notifications\u0022).  A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device\u0027s vendor/product IDs and its other interfaces.",
  "published": "2025-02-22T10:15:11Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00368,
  "epssPercentile": 0.30881,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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