CVE-2026-23097 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators of systems using hugetlb file folios should assess exposure and prioritize verification of affected systems. This includes reviewing system configurations, verifying patch application, and monitoring for potential deadlocks. Additionally, security teams and vulnerability management teams should be aware of this issue and track the verification and remediation process for affected systems.

Why it matters

A deadlock vulnerability in the Linux kernel's migration path for hugetlb file folios requires verification and patching to prevent potential system issues.

• Verification of affected Linux kernel systems is required to prevent potential deadlocks.
• Linux kernel maintainers and users should review and apply patches to correct the lock ordering issue.
• Systems using hugetlb file folios may be affected, and monitoring for potential deadlocks is recommended.

Technical summary

The Linux kernel's migration path for hugetlb file folios has a deadlock vulnerability due to incorrect lock ordering. A task holding folio_lock tries to acquire i_mmap_rwsem (read lock), while another task holds i_mmap_rwsem (write lock) and tries to acquire folio_lock. The issue is addressed by expanding the scope of the existing i_mmap_lock to cover calls to remove_migration_ptes(). This change ensures that the locks are acquired in a consistent order, preventing deadlocks. Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those using hugetlb file folios.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected systems, especially those using hugetlb file folios.

Recommended defensive actions

• Review and apply the provided patches to correct the lock ordering issue.
• Assess exposure and prioritize verification of affected Linux kernel systems.
• Monitor systems for potential deadlocks related to hugetlb file folios.
• Perform a thorough review of system configurations and hugetlb file folio usage.
• Verify that patches are applied and systems are not experiencing deadlocks.
• Track and document the verification process for affected systems.
• Continuously monitor for new information regarding this vulnerability.

Evidence notes

The CVE record and source item provide details on the vulnerability, including the incorrect lock ordering in the migration path for hugetlb file folios. However, specific exploitation details and victim information are not provided.

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.