CVE-2026-64487: Linux kernel · ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 19:28 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to address this issue by modifying the input parser loop to avoid unsigned underflow and out-of-bounds reads. Users should update to a Linux kernel version that includes this fix. Since this is a kernel-level vulnerability, applying the official kernel update is the recommended mitigation.
Description
A vulnerability in the Linux kernel ALSA caiaq driver for the Traktor Kontrol S4 device allows an out-of-bounds read due to improper handling of input message block lengths. The issue arises when the device sends a final short block smaller than the expected 16-byte message size, causing an unsigned integer underflow and subsequent out-of-bounds memory access. This flaw has been fixed by modifying the loop to only process full message blocks, preventing the underflow and dropping incomplete trailing blocks.
References
- git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91 (opens in a new tab)
- git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 (opens in a new tab)
- git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e (opens in a new tab)
- git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d (opens in a new tab)
- git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469 (opens in a new tab)
- git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0 (opens in a new tab)
- git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c (opens in a new tab)
- git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd (opens in a new tab)