CVE-2026-98918 Linux CVE debrief

Who should care

Defenders and administrators responsible for Linux kernel infrastructure, particularly those utilizing arm64 architectures, should assess exposure and prioritize patching. They should 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 and review compensating controls for

Why it matters

This vulnerability in the Linux kernel's mm/damon/ops-common requires attention from defenders and administrators, particularly those utilizing arm64 architectures, to verify and apply patches, assess exposure, and monitor updates.

• Verify patch application to prevent potential issues with page table walks on arm64 architectures
• Assess and update Linux kernel versions to ensure alignment with the latest security patches
• Monitor Linux kernel updates and advisories for potential impacts on arm64 architectures

Technical summary

The vulnerability involves the use of a page-aligned address in damon_ptep_mkold() within the Linux kernel's mm/damon/ops-common. This change was required due to updates in how the contpte helper walks page tables and clears young flags for large folios on arm64 architectures. The update ensures proper handling of page table walks and young flag clearing for large folios, particularly on arm64 architectures, to prevent potential issues. The technical details of the vulnerability are based on the official CVE Program record and source item, which provide information on the vulnerability and its resolution.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly those utilizing arm64 architectures.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this vulnerability
• Review and update Linux kernel versions to ensure alignment with the latest security patches
• Monitor Linux kernel updates and advisories for potential impacts on arm64 architectures
• Confirm 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 source item provide details on the vulnerability and its resolution in the Linux kernel. Specific commits addressing the issue are referenced. The evidence is based on the official CVE Program record and source item, which provide information on the vulnerability and its resolution. The commits referenced in the source item provide additional details on the patch and its implementation. However, the exact scope of affected systems and potential impacts on arm64 architectures requires further verification by the user

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.