{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "15c5ab607045e278ebf4d2ca4aea2250617d50ca"
            },
            {
              "fixed": "de5f9edc705497b1b2c6b173b22f283486d2fd91"
            },
            {
              "fixed": "70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334"
            },
            {
              "fixed": "884f575cc6acb136eb4a161d925147f85b59c27e"
            },
            {
              "fixed": "05df59b9a61f7ca66548df079d306c41da23845d"
            },
            {
              "fixed": "3cad86197c7bf8b45bb1d8adc1099d0913e80469"
            },
            {
              "fixed": "a5fd3122283bf75c04f6414bf610100beb0565b0"
            },
            {
              "fixed": "0680413f2f10aab43878dd3db711a6a9e45bab7c"
            },
            {
              "fixed": "f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.37"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64487.json"
  },
  "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": "CVE-2026-64487",
  "modified": "2026-07-27T03:56:18.254513424Z",
  "published": "2026-07-25T08:51:46.711Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64487.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64487"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser"
}