CVE-2026-64339

A flaw was found in the Linux kernel's USB subsystem, specifically within the usbio module. A malicious or malfunctioning Universal Serial Bus (USB) device can exploit this vulnerability by providing crafted input during a bulk IN transfer. This can lead to an out-of-bounds read, allowing the device to disclose sensitive information from adjacent memory to a local user.

This vulnerability is rated as Moderate severity because exploitation requires either physical access to attach a rogue USB peripheral or control over emulated devices in a virtualized host. While the flaw allows reading adjacent kernel slab memory, it is restricted to information disclosure and does not directly permit arbitrary code execution. Earlier enterprise releases, including RHEL 8 and 9, are unaffected as the underlying usbio driver is not present.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.