{
  "cveId": "CVE-2021-46986",
  "url": "https://patchblox.com/security/cve/CVE-2021-46986",
  "summary": "CVE-2021-46986 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46986, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  usb: dwc3: gadget: Free gadget structure only af...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  usb: dwc3: gadget: Free gadget structure only after freeing endpoints  As part of commit e81a7018d93a (\u0022usb: dwc3: allocate gadget structure dynamically\u0022) the dwc3_gadget_release() was added which will free the dwc-\u003Egadget structure upon the device\u0027s removal when usb_del_gadget_udc() is called in dwc3_gadget_exit().  However, simply freeing the gadget results a dangling pointer situation: the endpoints created in dwc3_gadget_init_endpoints() have their dep-\u003Eendpoint.ep_list members chained off the list_head anchored at dwc-\u003Egadget-\u003Eep_list.  Thus when dwc-\u003Egadget is freed, the first dwc3_ep in the list now has a dangling prev pointer and likewise for the next pointer of the dwc3_ep at the tail of the list. The dwc3_gadget_free_endpoints() that follows will result in a use-after-free when it calls list_del().  This was caught by enabling KASAN and performing a driver unbind. The recent commit 568262bf5492 (\u0022usb: dwc3: core: Add shutdown callback for dwc3\u0022) also exposes this as a panic during shutdown.  There are a few possibilities to fix this.  One could be to perform a list_del() of the gadget-\u003Eep_list itself which removes it from the rest of the dwc3_ep chain.  Another approach is what this patch does, by splitting up the usb_del_gadget_udc() call into its separate \u0022del\u0022 and \u0022put\u0022 components.  This allows dwc3_gadget_free_endpoints() to be called before the gadget is finally freed with usb_put_gadget().",
  "published": "2024-02-28T09:15:37Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00229,
  "epssPercentile": 0.13766,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-46986",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46986",
      "released": "2024-02-28T09:15:37Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-46986",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46986",
      "released": "2024-02-28T09:15:37Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-46986",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46986",
      "released": "2024-02-28T09:15:37Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}