CVE-2026-93250 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, System administrators and operators of Linux-based systems, Security teams and vulnerability management teams should assess exposure and prioritize remediation. The vulnerability can lead to system crashes, instability, or potential elevation of privileges.

Why it matters

This vulnerability can lead to system crashes, instability, or potential elevation of privileges. Linux kernel developers and maintainers, Linux distribution maintainers, system administrators, and operators of Linux-based systems should assess exposure and prioritize remediation.

• Potential system crashes or instability
• Possible elevation of privileges
• Potential data breaches or unauthorized access

Technical summary

The vxlan_mdb_flush() function in the Linux kernel is vulnerable to a use-after-free error. When an entry is removed, it can trigger the removal of another entry, leading to a use-after-free error. This can occur when flushing the remotes of a (*, G) entry, which also removes (S, G) entries that were created for its source list. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. Linux kernel developers and maintainers should assess exposure and prioritize remediation. The affected product is the Linux kernel.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided Linux kernel patches to fix the vulnerability
• Monitor systems for potential exploitation attempts
• Verify that affected systems are updated with the latest kernel patches
• 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 compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability. The Linux kernel patch notes and Git commit hashes are also provided as references. Linux kernel developers and maintainers should verify the affected scope and severity, and prioritize remediation. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. The affected product is the Linux kernel, and the vulnerability is related to the vxlan_mdb_flush() function.

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.