ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
Summary
| CVE | CVE-2026-64487 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-25 10:17:34 UTC |
| Updated | 2026-07-25 10:17:34 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001840000 probability, percentile 0.083470000 (date 2026-07-28)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca de5f9edc705497b1b2c6b173b22f283486d2fd91 git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 884f575cc6acb136eb4a161d925147f85b59c27e git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 05df59b9a61f7ca66548df079d306c41da23845d git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 3cad86197c7bf8b45bb1d8adc1099d0913e80469 git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca a5fd3122283bf75c04f6414bf610100beb0565b0 git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 0680413f2f10aab43878dd3db711a6a9e45bab7c git | Not specified |
| CNA | Linux | Linux | affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd git | Not specified |
| CNA | Linux | Linux | affected 2.6.37 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.37 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.96 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.39 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.4 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.