GHSA-5C4F-QFW8-C34W

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

USB: serial: belkin_sa: validate interrupt status length

The Belkin interrupt callback treats interrupt data as a four-byte status report and reads LSR/MSR fields at offsets 2 and 3. The interrupt-in buffer length is derived from endpoint wMaxPacketSize, and short interrupt transfers may complete successfully with a smaller actual_length.

Check the completed interrupt packet length before parsing status fields so short interrupt endpoints and short successful packets are ignored instead of causing out-of-bounds or stale status-byte reads.

KASAN report as below:

BUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback() Read of size 1 Call trace: belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202) __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630) dummy_timer() (?:?)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63903"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: belkin_sa: validate interrupt status length\n\nThe Belkin interrupt callback treats interrupt data as a four-byte\nstatus report and reads LSR/MSR fields at offsets 2 and 3. The\ninterrupt-in buffer length is derived from endpoint wMaxPacketSize, and\nshort interrupt transfers may complete successfully with a smaller\nactual_length.\n\nCheck the completed interrupt packet length before parsing status\nfields so short interrupt endpoints and short successful packets are\nignored instead of causing out-of-bounds or stale status-byte reads.\n\nKASAN report as below:\n\nBUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback()\nRead of size 1\nCall trace:\n  belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202)\n  __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630)\n  dummy_timer() (?:?)",
  "id": "GHSA-5c4f-qfw8-c34w",
  "modified": "2026-07-19T18:31:45Z",
  "published": "2026-07-19T18:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63903"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22823a319fb2afdf02cacafbed8b613b757efbc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37e54d1b986df35c936d81e5b59a7aa3ec6938f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ce058df2ee02cc2a0f0fd5cd64ce6f1482a0b65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a4602221cba7a738442328d66a2f0b1c9bf6e17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db1e7eb6203d534dad64cac2c793b69e561e657b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1617539ab90e67da788959bfd314076f093a11a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f361359a952da15e70e693c2d7dca5c5843eae3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffb739a49186ea784bbd9cb91b647f062395b419"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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