CVE-2025-71077 Linux CVE debrief

Who should care

Linux kernel maintainers, deployers, and users who utilize TPM functionality should assess exposure and apply patches. Security teams responsible for Linux kernel infrastructure should prioritize review and remediation.

Why it matters

CVE-2025-71077 is a medium-severity vulnerability in the Linux kernel that requires verification and patching to prevent potential limited impact. Linux kernel deployers and users should assess exposure and apply patches.

• Verify TPM bank allocation configuration to prevent potential limited impact from out-of-bounds values
• Review and apply patches to ensure the Linux kernel is up-to-date and secure
• Assess exposure of Linux kernel deployments using TPM functionality

Technical summary

The Linux kernel vulnerability (CVE-2025-71077) involves a lack of upper limit capping for PCR banks in the tpm2_get_pcr_allocation() function. This could potentially lead to limited harm if exploited with out-of-bounds values from external I/O. The CVSS score is 5.5, indicating a medium severity vulnerability. Linux kernel deployers and users should assess exposure and apply patches to ensure the Linux kernel is up-to-date and secure. The vulnerability has been addressed, and security teams responsible for Linux kernel infrastructure should prioritize review and remediation.

Defensive priority

Medium-priority defensive review and patching recommended for Linux kernel deployments, especially those using TPM functionality.

Recommended defensive actions

• Review and apply patches for the Linux kernel versions affected by CVE-2025-71077
• Inventory Linux kernel deployments for TPM usage and assess exposure
• Verify TPM bank allocation limits in Linux kernel configurations
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and NVD details provide information on the vulnerability, its CVSS score of 5.5, and the affected Linux kernel versions. Multiple patch references are provided, including official CVE Program records and NIST NVD detail pages. The vulnerability has been addressed in the Linux kernel, and deployers should verify TPM bank allocation configuration to prevent potential limited impact from out-of-bounds values. The Linux kernel versions affected by CVE-2025-71077 require verification and patching to prevent potential limited

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.