CVE-2026-93077 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess their exposure and apply patches or mitigations as needed. Linux kernel developers, maintainers, and users should verify patch application, monitor system logs, and assess exposure based on Linux kernel version and configuration.

Why it matters

This vulnerability in the Linux kernel's cxl/features subsystem requires verification of patch application and monitoring of system logs to prevent potential buffer overflows. Linux kernel developers, maintainers, and users should assess their exposure and apply patches or mitigations as needed.

• Verify patch application to prevent potential buffer overflows
• Monitor system logs for exploitation attempts
• Assess exposure based on Linux kernel version and configuration

Technical summary

The Linux kernel's cxl/features subsystem is vulnerable to a buffer overflow attack due to improper handling of the Get Feature output size. The cxl_get_feature() function uses a fixed output capacity in a loop, without accounting for the decreasing buffer size. This can cause the function to overflow the feat_out buffer if a device returns more data than requested. Linux kernel developers and maintainers should assess their exposure and apply patches or mitigations as needed. The vulnerability requires verification of patch application and monitoring of system logs to prevent potential buffer overflows.

Defensive priority

Medium

Recommended defensive actions

• Review and apply patches from the Linux kernel maintainers
• Update Linux kernel to a version that includes the fix
• Monitor system logs for potential exploitation attempts
• Verify patch application to prevent potential buffer overflows
• Assess exposure based on Linux kernel version and configuration
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, there is limited information on potential exploits or attacks. Linux kernel developers and maintainers should verify patch application, monitor system logs, and assess exposure based on Linux kernel version and configuration. The cxl_get_feature() function uses a fixed output capacity in a loop, without accounting for the decreasing buffer size. This can cause the function to overflow the feat_out buffer if a

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.