CVE-2026-92508 Linux CVE debrief

Who should care

Linux kernel developers and administrators responsible for maintaining and securing Linux-based systems should assess exposure and verify the patch has been applied. They should review and apply the patch to ensure proper synchronization and monitor the system for potential use-after-free errors. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review and track exceptions, retest remediated assets,

Why it matters

A use-after-free vulnerability in the Linux kernel's RDMA/core component requires verification of patch application to prevent potential use-after-free errors.

• Potential use-after-free errors may occur when accessing a CQ via the netlink path
• Verification of the patch application is necessary to prevent potential use-after-free errors
• Linux kernel developers and administrators should review and apply the patch to ensure proper synchronization

Technical summary

The Linux kernel's RDMA/core component has a use-after-free vulnerability due to improper synchronization in the ib_free_cq() function. This can lead to a potential use-after-free when accessing a CQ via the netlink path. The issue arises from the rdma_restrack_del() call being invoked too late, after vendor-specific resources associated with the CQ have already been freed. To address this, the rdma_restrack_del() call is moved to before the freeing of these resources, ensuring the CQ is removed from restrack before its internal resources are released.

Defensive priority

High

Recommended defensive actions

• Review and apply the patch to ensure the ib_free_cq() function is properly synchronized
• Verify the Linux kernel version and check if the patch has been applied
• Monitor the system for potential use-after-free errors
• 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
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score. However, the corpus does not establish versions, exploitation, impact, or remediation, which require verification from the supplied official sources.

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.