CVE intelligence

CVE-2026-100080

Vulnerability intelligence

Published Nov 6, 2026Sources checked Nov 10, 2026

N/ACVSS not listedScore unavailable

What this means

Review the available evidence

CVE-2026-100080. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Nov 9, 2026

Release Notes

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-100080?

In the Linux kernel, the following vulnerability has been resolved:

xen-netback: Fix UAF when reading statistics data

The network statistic data in the driver is protected by RCU. Unfortunately when tearing down the queues after an error during connecting to the frontend (e.g. due to illegal Xenstore data filled in by the guest), the statistic data is being freed without synchronizing the RCU state.

In case the data is being read via sysfs in this phase, access to already freed memory or memory being in new use is possible.

Fix that by calling synchronize_net() before freeing the queue data.

This is XSA-526 / CVE-2026-100080

Source: NVD