CVE-2026-97591 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers working with s390/crypto component should verify patch application and review system configurations for secure crypto engine handling. They should also review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

A vulnerability in the Linux kernel's s390/crypto component requires verification and patch application to prevent potential issues.

• Verify patch application for Linux kernel s390/crypto component
• Review system configurations for secure crypto engine handling

Technical summary

The Linux kernel's s390/crypto component has a vulnerability related to handling EBUSY in PHMAC when a request is pushed to the crypto engine. The fix involves correctly handling EBUSY as a return code indicating a successful transfer to the crypto engine. This vulnerability requires verification and patch application to prevent potential issues. Linux system administrators and security teams should review system configurations and ensure crypto engine handling is secure. The vulnerability has been resolved in the Linux kernel, but further verification is necessary to ensure system security.

Defensive priority

Verify and apply patches for Linux kernel s390/crypto component

Recommended defensive actions

• Verify Linux kernel version and apply patches for s390/crypto component
• Review system configurations and ensure crypto engine handling is secure
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information on affected systems, exploitation, or impact is limited. Defenders should verify patch application and review system configurations for secure crypto engine handling. The vulnerability has been resolved in the Linux kernel, but further verification is necessary to ensure system security.

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.