CVE-2026-64571 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability and take steps to mitigate it. This includes verifying that systems are up-to-date with the latest security patches, implementing additional monitoring and logging, and restricting access to affected systems and limiting the use of USB devices. Security teams should review system configurations and logs for suspicious activity and prioritize patching and mitigation efforts accordingly. Vulnerability management and security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Operators of affected systems should review compensating controls and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Platform administrators should check relevant monitoring, detection, and logs for exposed assets that need extra review. Asset inventory and change management processes should be reviewed to ensure that affected systems are properly tracked and remediated. Source tracking and exposure review should be performed to identify potential vulnerabilities and prioritize mitigation efforts. Rollback/change windows and compensating controls should be implemented to minimize the impact of the vulnerability. Monitoring and detection capabilities should be reviewed to ensure that potential exploitation attempts are detected and responded to promptly. Security teams should also review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. The Linux kernel community should review and test patches to ensure that they are effective and do not introduce new vulnerabilities. Linux distribution vendors should prioritize patching and mitigation efforts for affected systems and provide guidance to users on how to mitigate the vulnerability. Users of Linux-based systems should ensure that systems are up-to-date with the latest security patches and implement additional monitoring and logging to detect potential exploitation attempts. Compensating controls, such as restricting access to affected system

Technical summary

The p54_rx_eeprom_readback() function in the Linux kernel does not validate the RX frame length, leading to a buffer overflow vulnerability. A malicious USB device can send a short frame with a truncated payload, causing the function to read past the end of the skb and leak adjacent heap memory. The vulnerability can be mitigated by ensuring that the Linux kernel is up-to-date with the latest security patches and implementing additional monitoring and logging to detect potential exploitation attempts.

Defensive priority

High

Recommended defensive actions

• Verify that the Linux kernel is up-to-date with the latest security patches
• Implement additional monitoring and logging to detect potential exploitation attempts
• Restrict access to the affected system and limit the use of USB devices
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability is caused by a lack of validation of the RX frame length in the p54_rx_eeprom_readback() function. This can lead to a buffer overflow when a malicious USB device sends a short frame with a truncated payload. The issue was resolved by adding a check to ensure that the slice fits in the skb before copying. Evidence limits suggest that affected scope and impact may be limited to specific configurations and deployments. Defenders should verify system configurations, review logs for suspicious activity, and ensure that systems are up-to-date with the latest security patches.

Official resources