Vulnerability-Lookup

CVE-2026-64487 (GCVE-0-2026-64487)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/de5f9edc705497b1b…
https://git.kernel.org/stable/c/70d6d4cfa4ad09688…
https://git.kernel.org/stable/c/884f575cc6acb136e…
https://git.kernel.org/stable/c/05df59b9a61f7ca66…
https://git.kernel.org/stable/c/3cad86197c7bf8b45…
https://git.kernel.org/stable/c/a5fd3122283bf75c0…
https://git.kernel.org/stable/c/0680413f2f10aab43…
https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < de5f9edc705497b1b2c6b173b22f283486d2fd91 (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < 884f575cc6acb136eb4a161d925147f85b59c27e (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < 05df59b9a61f7ca66548df079d306c41da23845d (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < 3cad86197c7bf8b45bb1d8adc1099d0913e80469 (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < a5fd3122283bf75c04f6414bf610100beb0565b0 (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < 0680413f2f10aab43878dd3db711a6a9e45bab7c (git) Affected: 15c5ab607045e278ebf4d2ca4aea2250617d50ca , < f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd (git)
Linux	Linux	Affected: 2.6.37 Unaffected: 0 , < 2.6.37 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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          "value": "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."
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/usb/caiaq/input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"de5f9edc705497b1b2c6b173b22f283486d2fd91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"884f575cc6acb136eb4a161d925147f85b59c27e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"05df59b9a61f7ca66548df079d306c41da23845d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"3cad86197c7bf8b45bb1d8adc1099d0913e80469\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"a5fd3122283bf75c04f6414bf610100beb0565b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"0680413f2f10aab43878dd3db711a6a9e45bab7c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15c5ab607045e278ebf4d2ca4aea2250617d50ca\",\"lessThan\":\"f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/usb/caiaq/input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.37\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.37\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:25Z",
      "cve": "CVE-2026-64487",
      "id": "CVE-2026-64487",
      "initial_release_date": "2026-07-25T15:58:25Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64487",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64487.json",
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}

GHSA-X4V5-HFH7-VRG5

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

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.

Show details on source website

JSON

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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": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64487 (GCVE-0-2026-64487)

GHSA-X4V5-HFH7-VRG5

Tags

Sightings

Nomenclature