CVE-2026-46325 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers working with RDMA/rxe should review and apply patches, verify system configurations, and monitor logs for potential exploitation attempts. They should also check relevant monitoring, detection, and logs for exposed assets that need extra review.

Why it matters

This vulnerability in the Linux kernel's RDMA/rxe component can lead to incorrect iova-to-va conversions, potentially allowing unintended memory access or modification. Linux system administrators and security teams should review and apply patches, verify system configurations, and monitor logs for potential exploitation attempts.

• Verify memory region page sizes and system PAGE_SIZE configurations
• Monitor for potential exploitation attempts through system logs
• Apply patches from Linux vendors for affected versions

Technical summary

The vulnerability is in the RDMA/rxe component of the Linux kernel, specifically in the iova-to-va conversion for memory regions with page sizes different from the system PAGE_SIZE. This can lead to incorrect conversions and potential security issues. The vulnerability is caused by incorrect handling of memory regions (MRs) with page sizes different from the system PAGE_SIZE. ib_sg_to_page() has ensured that when i>=1 either a) SG[i-1].dma_end and SG[i].dma_addr are contiguous or b) SG[i-1].dma_end and SG[i].dma_addr are mr->page_size aligned.

Defensive priority

High

Recommended defensive actions

• Review and apply patches from Linux vendors for the affected versions
• Verify system configurations and update package lists
• Monitor system logs for potential exploitation attempts
• 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
• 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

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, there is limited information on potential exploits or attacks. The vulnerability is in the RDMA/rxe component of the Linux kernel, specifically in the iova-to-va conversion for memory regions with page sizes different from the system PAGE_SIZE.

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.