CVE-2026-74607 Linux CVE debrief

Who should care

Linux administrators and users of KVM with SVM enabled should assess their exposure to this high-severity vulnerability and take necessary remediation steps to prevent potential list corruption and incorrect VM destruction. This includes verifying system configurations and kernel versions, applying patches or updates provided by Linux kernel maintainers, and monitoring system logs for suspicious activities related to KVM and SVM operations. Additionally, a

Why it matters

CVE-2026-74607 is a high-severity vulnerability in the Linux kernel's KVM subsystem, specifically affecting SVM. It allows for race conditions leading to list corruption and incorrect VM destruction. Linux administrators and users of KVM with SVM enabled should assess their exposure and take necessary remediation steps.

• Potential list corruption and incorrect VM destruction in KVM with SVM.
• Race conditions may lead to security issues in concurrent VM operations.
• Verification of system configurations and kernel versions is necessary.
• Patch application or updates from Linux kernel maintainers are required.

Technical summary

The Linux kernel's KVM subsystem, specifically the SVM implementation, is vulnerable to a race condition that can lead to list corruption and incorrect VM destruction. This issue arises from the interaction between KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM and KVM_CAP_VM_COPY_ENC_CONTEXT_FROM. The vulnerability has been resolved through the serialization of accesses to the owner and mirror list with separate locks.

Defensive priority

High-priority assessment and remediation are recommended for systems utilizing KVM with SVM, particularly those with concurrent VM operations.

Recommended defensive actions

• Assess exposure for KVM with SVM deployments, especially those with concurrent VM operations.
• Verify system configurations and kernel versions to identify potential vulnerabilities.
• Apply patches or updates provided by Linux kernel maintainers.
• Monitor system logs for suspicious activities related to KVM and SVM operations.
• Perform vulnerability scanning to identify exposed systems.
• Implement compensating controls for exposed systems while remediation is scheduled.
• Track and document remediation progress and verification results.

Evidence notes

The CVE record and associated source item provide details on the vulnerability, its impact, and the fixes applied. However, specific version ranges and detailed exploitation scenarios require verification from official Linux kernel sources.

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.