CVE-2026-93229 Linux CVE debrief

Who should care

Linux kernel developers, administrators, and users of nfsd should assess exposure and prioritize verification of affected systems. This includes reviewing Linux kernel versions for potential exposure, verifying system configurations for nfsd usage, and updating the Linux kernel to the latest version if necessary. Additionally, they should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Why it matters

The vulnerability in the Linux kernel's nfsd could cause issues on weakly-ordered architectures if not addressed. Linux kernel developers and administrators should assess exposure and prioritize verification of affected systems.

• Verify Linux kernel versions for potential exposure
• Assess system configurations for nfsd usage

Technical summary

The Linux kernel's nfsd has a vulnerability due to a missing read memory barrier in nfsd_nl_rpc_status_get_dumpit(). This could cause issues on weakly-ordered architectures. The vulnerability in the Linux kernel's nfsd could cause issues on weakly-ordered architectures if not addressed. Linux kernel developers and administrators should assess exposure and prioritize verification of affected systems. The hand-rolled seqcount-like protocol in nfsd_nl_rpc_status_get_dumpit() was missing a read memory barrier (smp_rmb) before its second counter check.

Defensive priority

Linux kernel developers and administrators should assess exposure and prioritize verification of affected systems.

Recommended defensive actions

• Review Linux kernel versions for potential exposure
• Verify system configurations for nfsd usage
• Update Linux kernel to the latest version if necessary
• 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. The Linux kernel developers have addressed the issue by adding a read memory barrier. This vulnerability could cause issues on weakly-ordered architectures if not addressed. Linux kernel developers and administrators should assess exposure and prioritize verification of affected systems. The hand-rolled seqcount-like protocol in nfsd_nl_rpc_status_get_dumpit() was missing a read memory barrier (smp_rmb) before its second counter check. This could cause the CPU to make

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.