CVE-2026-98003 Linux CVE debrief

Who should care

Linux kernel maintainers, administrators, and users of systems with AMD IOMMU configurations should be aware of this vulnerability. Maintainers need to ensure that patches are developed and tested, while administrators must assess their systems' exposure and apply patches or updates as needed. Users of systems with AMD IOMMU configurations should also be informed about potential risks and the importance of keeping their systems up-to-date.

Why it matters

Defenders should assess exposure for Linux kernel systems using AMD IOMMU, focusing on version and configuration specifics, and apply patches or updates addressing the GA log buffer reallocation issue.

• Memory leak potential due to repeated GA log buffer allocation on resume.
• Improper GFP_KERNEL usage in a syscore resume callback with disabled interrupts.

Technical summary

The Linux kernel vulnerability involves a change in GA log buffer allocation for AMD IOMMU, potentially causing memory leaks and improper GFP_KERNEL usage in a syscore resume callback. This could lead to system instability and security risks if not addressed. The vulnerability is related to the iommu/amd module and its handling of GA log buffers during resume operations. Understanding the technical details requires knowledge of Linux kernel internals, particularly the IOMMU (Input-Output Memory Management Unit) and its role in managing memory access.

Defensive priority

Assess and apply patches for Linux kernel systems using AMD IOMMU, focusing on version and configuration specifics.

Recommended defensive actions

• Review Linux kernel configurations and versions for AMD IOMMU usage.
• Apply patches or updates addressing the GA log buffer reallocation issue.
• Monitor system logs for potential memory leak or allocation failures.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• 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.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional verification is needed to confirm affected versions and configurations. Defenders should verify Linux kernel versions, AMD IOMMU usage, and system configurations to assess potential exposure. This may involve reviewing system logs for signs of memory leaks or allocation failures and ensuring that patches or updates are applied. The vulnerability highlights the importance of rigorous testing and validation of kernel patches.

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.