CVE-2026-64487
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.
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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.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d
- https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c
- https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469
- https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334
- https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e
- https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0
- https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91
- https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd
JSON original (NVD)
Mostrar
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"id": "CVE-2026-64487",
"cveTags": [],
"metrics": {},
"affected": [
{
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{
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{
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"version": "5.10.261",
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{
"status": "unaffected",
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"versionType": "semver",
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{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
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{
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"versionType": "semver",
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{
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"version": "6.18.39",
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"published": "2026-07-25T10:17:34.423",
"references": [
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"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->actual_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->actual_length before dispatching."
}
],
"lastModified": "2026-08-17T05:17:54.550",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}