ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
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.
CVE-2026-64487
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:CVE-2026-64487
Kernel
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 5.10.261
Source reference:
/affected/1/ranges5.15.212Source reference:
/affected/1/ranges6.1.178Source reference:
/affected/1/ranges6.6.145Source reference:
/affected/1/ranges6.12.96Source reference:
/affected/1/ranges6.18.39Source reference:
/affected/1/ranges7.1.4Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "15c5ab607045e278ebf4d2ca4aea2250617d50ca"
},
{
"fixed": "de5f9edc705497b1b2c6b173b22f283486d2fd91"
},
{
"fixed": "70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334"
},
{
"fixed": "884f575cc6acb136eb4a161d925147f85b59c27e"
},
{
"fixed": "05df59b9a61f7ca66548df079d306c41da23845d"
},
{
"fixed": "3cad86197c7bf8b45bb1d8adc1099d0913e80469"
},
{
"fixed": "a5fd3122283bf75c04f6414bf610100beb0565b0"
},
{
"fixed": "0680413f2f10aab43878dd3db711a6a9e45bab7c"
},
{
"fixed": "f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64487.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"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"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64487.json"
}
}
]- Related CVEs
- CVE-2026-64487
Source reference:
/id
Publisher severity
No explicit severity was provided.
- Event
- #50772 · Revision 1
- Added to Heist Feed
- Publisher date