CVE-2026-64487ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
- 7.1HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
- 6 days later
· 6 days later
First scored
High 7.1
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < de5f9edc705497b1b2c6b173b22f283486d2fd91
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < 884f575cc6acb136eb4a161d925147f85b59c27e
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < 05df59b9a61f7ca66548df079d306c41da23845d
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < 3cad86197c7bf8b45bb1d8adc1099d0913e80469
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < a5fd3122283bf75c04f6414bf610100beb0565b0
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < 0680413f2f10aab43878dd3db711a6a9e45bab7c
- affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca – < f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd
- affected 2.6.37
- unaffected < 2.6.37
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91 (opens in a new tab)
- https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 (opens in a new tab)
- https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e (opens in a new tab)
- https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d (opens in a new tab)
- https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469 (opens in a new tab)
- https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0 (opens in a new tab)
- https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c (opens in a new tab)
- https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48831 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64487)Record last updated .