GHSA-X4V5-HFH7-VRG5

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31
VLAI
Details

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

ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser

snd_usb_caiaq_tks4_dispatch() decodes the Traktor Kontrol S4 input stream in fixed 16-byte (TKS4_MSGBLOCK_SIZE) message blocks. On every iteration it advances buf and subtracts the block size while looping on "while (len)".

len is urb->actual_length. That value is supplied by the device and is not guaranteed to be a multiple of 16. When a final short block leaves len between 1 and 15, the loop runs once more, reads up to buf[15], and then does "len -= TKS4_MSGBLOCK_SIZE". As len is unsigned this underflows to a huge value. The loop then keeps iterating and walking buf far past the end of the 512-byte ep4_in_buf, reading out of bounds until a bogus block id happens to be hit.

Iterate only while a full message block is available. This stops the unsigned underflow and silently drops any trailing partial block, which carries no complete control value anyway.

The sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1 and Maschine arms in snd_usb_caiaq_ep4_reply_dispatch() floor urb->actual_length before dispatching.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64487"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser\n\nsnd_usb_caiaq_tks4_dispatch() decodes the Traktor Kontrol S4 input\nstream in fixed 16-byte (TKS4_MSGBLOCK_SIZE) message blocks. On every\niteration it advances buf and subtracts the block size while looping on\n\"while (len)\".\n\nlen is urb-\u003eactual_length. That value is supplied by the device and is\nnot guaranteed to be a multiple of 16. When a final short block leaves\nlen between 1 and 15, the loop runs once more, reads up to buf[15], and\nthen does \"len -= TKS4_MSGBLOCK_SIZE\". As len is unsigned this underflows\nto a huge value. The loop then keeps iterating and walking buf far past\nthe end of the 512-byte ep4_in_buf, reading out of bounds until a bogus\nblock id happens to be hit.\n\nIterate only while a full message block is available. This stops the\nunsigned underflow and silently drops any trailing partial block, which\ncarries no complete control value anyway.\n\nThe sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1\nand Maschine arms in snd_usb_caiaq_ep4_reply_dispatch() floor\nurb-\u003eactual_length before dispatching.",
  "id": "GHSA-x4v5-hfh7-vrg5",
  "modified": "2026-07-25T12:31:37Z",
  "published": "2026-07-25T12:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64487"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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