CVE-2026-74295 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and apply patches or updates as necessary to prevent potential array overreads due to out-of-range enum values. This vulnerability allows an out-of-range enum value to be written, potentially causing the driver to read past the texts array.

Why it matters

This vulnerability allows an out-of-range enum value to be written, potentially causing the driver to read past the texts array. Linux kernel developers and users should assess exposure and apply patches or updates as necessary.

• Potential array overreads due to out-of-range enum values
• Verification of Linux kernel versions and patch application is necessary
• Monitoring system logs for potential exploitation attempts is recommended

Technical summary

The hdac_hdmi_set_pin_port_mux function in the Linux kernel did not properly validate written enum values, allowing an out-of-range value to be written. This could cause the driver to read past the texts array before the helper function rejects the write. The vulnerability is related to the hdac_hdmi_set_pin_port_mux function in the Linux kernel, which did not properly validate written enum values. Linux kernel developers and users should assess exposure and apply patches or updates as necessary to prevent potential array overreads due to out-of-range enum values.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch for the hdac_hdmi_set_pin_port_mux function
• Verify the Linux kernel version and apply updates as necessary
• Monitor system logs for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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 CVE record and source item provide details on the vulnerability, including its description and affected versions. The Linux kernel vulnerability allows an out-of-range enum value to be written, potentially causing the driver to read past the texts array. This issue has been resolved in the Linux kernel. The hdac_hdmi_set_pin_port_mux function in the Linux kernel did not properly validate written enum values, allowing an out-of-range value to be written.

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.