CVE-2026-31462 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators should assess exposure and apply patches to prevent potential interrupt issues related to PASID reuse in the drm/amdgpu component. This includes reviewing and applying patches, monitoring kernel updates, and prioritizing patching for affected kernel versions.

Why it matters

A medium-severity vulnerability was resolved in the Linux kernel, affecting the drm/amdgpu component. The issue involves preventing immediate PASID reuse, which could cause interrupt problems when a process exits and frees up its PASID. Linux kernel maintainers and users should assess exposure and apply patches to prevent potential interrupt issues.

• Verify and apply patches to prevent potential interrupt issues
• Assess exposure and prioritize patching for affected kernel versions
• Monitor kernel updates and patch releases for potential issues

Technical summary

The Linux kernel drm/amdgpu component has a vulnerability related to immediate PASID reuse, which could cause interrupt issues. The issue is resolved through patches that utilize an idr cyclic allocator to manage PASID allocation effectively, similar to the kernel pid's approach. This change prevents the immediate reuse of PASIDs, thereby mitigating the risk of interrupt problems when a process exits and frees up its PASID. Linux kernel maintainers and users should assess exposure and apply patches to prevent potential interrupt issues.

Defensive priority

Linux kernel maintainers and users should assess exposure and apply patches to prevent potential interrupt issues.

Recommended defensive actions

• Review and apply patches to the Linux kernel to prevent immediate PASID reuse
• Assess exposure and prioritize patching for affected kernel versions
• Monitor kernel updates and patch releases for potential issues
• Verify 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 NVD entry provide details on the vulnerability, including its description, CVSS score, and affected kernel versions. The issue is resolved through patches that prevent immediate PASID reuse, which could cause interrupt issues. The patches utilize an idr cyclic allocator similar to the kernel pid's to manage PASID allocation effectively.

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.