Out-of-bounds read in Linux kernel - CVE-2026-64339
Published: July 27, 2026
Vulnerability identifier: #VU139645
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64339
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows an attacker with physical access to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in usbio_bulk_msg() when processing a crafted bulk IN response from a malicious USB device. An attacker with physical access can supply a device that reports a response length larger than the received transfer to disclose sensitive information.
The issue affects the bulk data path; the control path is not affected.
How to mitigate CVE-2026-64339
Install security update from vendor's repository.