SB20260727240 - Information disclosure in Linux kernel usb serial driver

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Main Vulnerability Database SB20260727240

SB20260727240 - Information disclosure in Linux kernel usb serial driver

Published: July 27, 2026

Security Bulletin ID SB20260727240
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Information disclosure (CVE-ID: CVE-2026-64336)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an information leak in the keyspan_pda USB serial driver write() callback when handling write operations. A local user can trigger a write operation that causes the line discipline to continue reading data beyond the tty write buffer to disclose sensitive information.

The issue occurs because the driver may report accepting more characters than were actually passed to write().


Remediation

Install update from vendor's website.

References