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CVE-2026-64487

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

publishedCWE-125

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.

Technical severity7.1 highCVSS 3.1 · NVD: [email protected]

Published2026-07-25Source updated 2026-11-12

Collected2026-11-123 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Linux Linux	≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < de5f9edc705497b1b2c6b173b22f283486d2fd91 (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < 884f575cc6acb136eb4a161d925147f85b59c27e (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < 05df59b9a61f7ca66548df079d306c41da23845d (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < 3cad86197c7bf8b45bb1d8adc1099d0913e80469 (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < a5fd3122283bf75c04f6414bf610100beb0565b0 (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < 0680413f2f10aab43878dd3db711a6a9e45bab7c (affected, git) ≥ 15c5ab607045e278ebf4d2ca4aea2250617d50ca; < f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd (affected, git) Other versions: unaffected	CNA: Linux
Linux Linux	2.6.37 (affected) ≥ 0; < 2.6.37 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.96; ≤ 6.12.* (unaffected, semver) ≥ 6.18.39; ≤ 6.18.* (unaffected, semver) ≥ 7.1.4; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected	CNA: Linux

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.10.261",
            "versionStartIncluding": "2.6.37",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.15.212",
            "versionStartIncluding": "5.11",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.1.178",
            "versionStartIncluding": "5.16",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.6.145",
            "versionStartIncluding": "6.2",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.12.96",
            "versionStartIncluding": "6.7",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.18.39",
            "versionStartIncluding": "6.13",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "7.1.4",
            "versionStartIncluding": "6.19",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.1 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91CNA: Linux
https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334CNA: Linux
https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27eCNA: Linux
https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845dCNA: Linux
https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469CNA: Linux
https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0CNA: Linux
https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7cCNA: Linux
https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fdCNA: Linux
https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch
https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd416baaa9-dc9f-4396-8d5f-8c081fb06d67 · Patch

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