Kernel memory over-read via short USB block
Published Jul 25, 2026 · Updated Jul 25, 2026
Out-of-bounds read in the Linux Kernel ALSA caiaq driver allows physically proximate attackers to read beyond a kernel input buffer. snd_usb_caiaq_tks4_dispatch() processes 16-byte blocks while any unsigned device-supplied length remains, so a 1-to-15-byte tail underflows the counter and advances beyond ep4_in_buf. Exploitation requires a malformed Traktor Kontrol S4 USB input stream; the record shows uncontrolled kernel-memory reads but no path that returns those bytes to the device.
Summary
What happened
Out-of-bounds read in the Linux Kernel ALSA caiaq driver allows physically proximate attackers to read beyond a kernel input buffer. snd_usb_caiaq_tks4_dispatch() processes 16-byte blocks while any unsigned device-supplied length remains, so a 1-to-15-byte tail underflows the counter and advances beyond ep4_in_buf. Exploitation requires a malformed Traktor Kontrol S4 USB input stream; the record shows uncontrolled kernel-memory reads but no path that returns those bytes to the device.
The record
- CVE
- CVE-2026-64487
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <05df59b9a61f7ca66548df079d306c41da23845d
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <0680413f2f10aab43878dd3db711a6a9e45bab7c
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <3cad86197c7bf8b45bb1d8adc1099d0913e80469
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <884f575cc6acb136eb4a161d925147f85b59c27e
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <a5fd3122283bf75c04f6414bf610100beb0565b0
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <de5f9edc705497b1b2c6b173b22f283486d2fd91
- Affected versionversion=15c5ab607045e278ebf4d2ca4aea2250617d50ca <f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd
- Affected versionversion=2.6.37
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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