SB20260507189 - Improper input validation in Linux kernel net usb driver

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Main Vulnerability Database SB20260507189

SB20260507189 - Improper input validation in Linux kernel net usb driver

Published: May 7, 2026

Security Bulletin ID SB20260507189
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Physical access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-43156)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows an attacker with physical access to cause a denial of service.

The vulnerability exists due to improper input validation in pegasus_probe() when probing a malformed USB device with mismatched endpoint descriptors. An attacker with physical access can connect a specially crafted USB device to cause a denial of service.

The issue is triggered because the driver assumes fixed endpoint numbers and transfer types for RX, TX, and status interrupt URBs.


Remediation

Install update from vendor's website.

References