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VulnerabilityPublished Updated

CVE-2026-64487: Linux kernel · ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 3 Nov 2026, 19:28 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

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