CVE-2026-64487
ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
July 25, 2026, 10:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64487
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest patched version.
- Ensure ALSA drivers are updated.
- Apply specific kernel patches for the Traktor Kontrol S4.
- Test for input parser stability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64487.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64487 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64487
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64487 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64487 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': 'de5f9edc705497b1b2c6b173b22f283486d2fd91', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': '70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': '884f575cc6acb136eb4a161d925147f85b59c27e', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': '05df59b9a61f7ca66548df079d306c41da23845d', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': '3cad86197c7bf8b45bb1d8adc1099d0913e80469', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': 'a5fd3122283bf75c04f6414bf610100beb0565b0', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': '0680413f2f10aab43878dd3db711a6a9e45bab7c', 'versionType': 'git'}, {'status': 'affected', 'version': '15c5ab607045e278ebf4d2ca4aea2250617d50ca', 'lessThan': 'f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd', 'versionType': 'git'}], 'programFiles': ['sound/usb/caiaq/input.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.37'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.37', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['sound/usb/caiaq/input.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d Added Reference https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c Added Reference https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469 Added Reference https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 Added Reference https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e Added Reference https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0 Added Reference https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91 Added Reference https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd