{
  "cveId": "CVE-2026-63896",
  "url": "https://patchblox.com/security/cve/CVE-2026-63896",
  "summary": "CVE-2026-63896 is fixed in 53 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: composite: fix integer underflow in...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: composite: fix integer underflow in WebUSB GET_URL handling  The WebUSB GET_URL handler in composite_setup() narrows landing_page_length to fit the host-supplied wLength using  \tlanding_page_length = w_length \t\t- WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH \u002B landing_page_offset;  If wLength is smaller than WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH the unsigned subtraction wraps, and the subsequent  \tmemcpy(url_descriptor-\u003EURL, \t       cdev-\u003Elanding_page \u002B landing_page_offset, \t       landing_page_length - landing_page_offset);  ends up copying close to UINT_MAX bytes from cdev-\u003Elanding_page into cdev-\u003Ereq-\u003Ebuf.  KASAN reports a slab-out-of-bounds in composite_setup on the kmalloc-2k gadget_info allocation, and FORTIFY_SOURCE traps the memcpy as a 4294967293-byte field-spanning write into url_descriptor-\u003EURL (size 252).  A USB host can reach this from a single SETUP packet against any gadget that has webusb/use=1 and a landingPage configured.  Handle the small-wLength case before the math: when the host requested fewer bytes than the URL descriptor header, only the header is meaningful and no URL bytes need to be copied.  Setting landing_page_length to landing_page_offset makes the existing memcpy a no-op and leaves the descriptor returned to the host unchanged for all larger wLength values.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "important",
  "epss": 0.00214,
  "epssPercentile": 0.1186,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "ALAS2023-2026-1968",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1968",
      "released": "2026-07-20T09:00:00Z"
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      "fix": "ALAS2023-2026-1968",
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      "fix": "ALAS2023-2026-1881",
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