In the Linux kernel, a vulnerability has been identified that involves a state inconsistency during gadget initialization. When the cdns3_gadget_start() function fails, the DRD hardware remains in gadget mode while the software state remains INACTIVE, leading to a critical inconsistency between hardware and software states.
This inconsistency can cause significant issues when the system attempts to switch to host mode. Specifically, when executing the command 'echo host > /sys/class/usb_role/13180000.usb-role-switch/role', the role state is not set correctly, which can lead to a failure in cleanup operations.
The consequences include a synchronous external abort during the host controller setup, violating the DRD controller design specifications and potentially leading to system instability.
Risk to organizations includes potential system crashes and operational disruptions. Given the nature of this vulnerability, organizations should prioritize patching immediately.
The vulnerability is currently classified as awaiting analysis, with no known public exploits or Proof of Concepts available. Organizations should remain vigilant and monitor for updates.
Vulnerability Details
This vulnerability allows for a state inconsistency to occur within the Linux kernel. The specific issue arises during the initialization of the CDNS3 USB gadget, where a failure in the cdns3_gadget_start() function leads to the DRD hardware remaining in gadget mode, leaving the software state inactive.
The severity level is currently unknown, with a CVSS score not officially assigned. However, the potential impact on operational continuity is significant, requiring immediate attention from organizations.
The vulnerability was published on May 1, 2026, and is yet to be analyzed fully. Organizations using affected versions of the Linux kernel should prepare for potential risks associated with this vulnerability.
Technical Analysis
The root cause of this vulnerability is a failure in the initialization process of the CDNS3 USB gadget. When the cdns3_gadget_start() function fails, the hardware is left in an inconsistent state, while the software remains inactive.
The attack vector for this vulnerability is considered to be local, as it requires access to the affected system to initiate the role switch. The attack complexity is low, as the vulnerability can be triggered with a simple command.
No user interaction is required to exploit this vulnerability, which increases its risk profile. The impact on confidentiality, integrity, and availability is currently not assessed, but potential disruptions to system operations are anticipated.
Risk & Impact Analysis
Real-world deployment risk is high, as this vulnerability can lead to system crashes during critical operations. Organizations using affected versions of the Linux kernel must understand the potential implications of this vulnerability on their operational capabilities.
Given the severity of potential impacts, organizations should address this vulnerability in their priority patch cycle. Furthermore, understanding the blast radius is essential, as this vulnerability can affect multiple systems relying on the Linux kernel.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, specific version ranges affected by CVE-2026-31754 are not available. Organizations should assume that all versions prior to vendor patch are vulnerable until further information is disclosed.
Mitigation & Remediation
Organizations should prioritize remediation efforts for this vulnerability. Patch updates should be applied once available. For immediate action, organizations can implement workarounds by ensuring that the DRD gadget state is cleaned up properly upon failure.
Configuration hardening and network controls should be assessed to minimize potential risks until a patch is applied. Additionally, organizations should consider engaging in penetration testing to validate the effectiveness of their remediation efforts.
Detection Guidance
Organizations should monitor logs for indicators of the vulnerability being exploited, such as abnormal state transitions or errors related to the USB subsystem. Behavioral anomalies during USB gadget initialization should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to disrupt device communication and functionality. Security teams should remain vigilant and continuously assess their systems for similar vulnerabilities.
This incident highlights the importance of rigorous testing and validation during software development, particularly for critical components like the Linux kernel. Organizations can benefit from adopting a comprehensive vulnerability management program to identify and remediate such issues proactively.
For further insights, organizations should also explore the effectiveness of their incident response strategies to ensure preparedness against future vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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