CVE-2026-98145 Linux CVE debrief

Who should care

Linux kernel developers, system administrators, and security teams should assess exposure and apply patches to prevent potential faults. They should verify Linux kernel versions, review system configurations, and monitor system logs for potential faults on the vmap guard page. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review.

Why it matters

A vulnerability in the Linux kernel has been resolved, where a command chain with zero commands could pass the payload length check and submit a request with a zero-length buffer, potentially causing a fault on the vmap guard page. Linux kernel developers, system administrators, and security teams should assess exposure and apply patches to prevent potential faults.

• Verify Linux kernel versions to prevent potential faults
• Validate command chains to prevent zero-length buffer submissions
• Monitor system logs for potential faults on the vmap guard page
• Apply patches to resolve the vulnerability

Technical summary

The Linux kernel vulnerability occurs when a command chain with zero commands passes the payload length check and submits a request with a zero-length buffer, potentially causing a fault on the vmap guard page. This is due to the fact that struct_size(payload, data, 0) only accounts for the header, allowing the chain to pass the payload length check. The fill loop does not execute, leaving the offset at zero. On firmware without AIE2_NPU_COMMAND, the submission proceeds, potentially leading to a fault when drm_clflush_virt_range(cmd_buf, 0) is called.

Defensive priority

Verify Linux kernel versions and apply patches to prevent potential faults

Recommended defensive actions

• Verify Linux kernel versions and apply patches
• Review system configurations and ensure proper validation of command chains
• Monitor system logs for potential faults on the vmap guard page
• 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 references indicate a vulnerability in the Linux kernel that has been resolved. However, details about affected versions, exploitation, and impact are limited. The issue is related to the AMD XDNA accelerator, where a command chain with zero commands could lead to a fault. The fix involves rejecting such command chains. Defenders should verify Linux kernel versions, review system configurations, and monitor system logs for potential faults.

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.