CVE-2026-93190 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, ChromeOS EC firmware developers, system administrators responsible for Linux kernel updates and security patches, and security teams responsible for vulnerability management and incident response. These individuals should review and apply the patch, validate source and sink cap counts, and monitor system logs for potential buffer overflow errors.

Why it matters

The CVE-2026-93190 vulnerability in the Linux kernel's cros_ec_typec module requires immediate attention from Linux kernel developers, maintainers, and system administrators. The vulnerability can lead to a buffer overflow, potentially causing a system crash or code execution. It is essential to review and apply the patch to prevent potential attacks.

• Potential system crash or code execution due to buffer overflow
• Increased risk of privilege escalation or denial-of-service attacks
• Need for validation of source and sink cap counts to prevent buffer overflow

Technical summary

The Linux kernel's platform/chrome cros_ec_typec module is vulnerable to a buffer overflow attack due to insufficient validation of source and sink cap counts from the ChromeOS EC firmware. The vulnerability can be exploited by providing a specially crafted source or sink cap count that exceeds the maximum allowed value of 7, potentially causing a system crash or code execution. This issue can be mitigated by reviewing and applying the patch to the Linux kernel's cros_ec_typec module, validating the source and sink cap counts, and monitoring system logs for potential buffer overflow errors.

Defensive priority

High

Recommended defensive actions

• Review and apply the patch to the Linux kernel's cros_ec_typec module
• Validate the source and sink cap counts in the cros_typec_register_partner_pdos function
• Monitor system logs for potential buffer overflow errors
• Perform a thorough review of the system for potential signs of compromise
• Implement additional monitoring and logging to detect similar vulnerabilities
• Review and update incident response plans to address potential buffer overflow attacks
• Conduct a thorough risk assessment to identify potential vulnerabilities in the system

Evidence notes

The CVE record and associated sources indicate a buffer overflow vulnerability in the Linux kernel's cros_ec_typec module. The issue is caused by a lack of validation for source and sink cap counts from the ChromeOS EC firmware. The vulnerability has been patched by adding validation checks for these counts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.