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CVE-2026-68166

Published Aug 10, 2026 EPSS 0.20% (10th pctl)

Overview

CVE-2026-68166 is a known-severity vulnerability. It was published on August 10, 2026.

Technical Description

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

userfaultfd: prevent registration of special VMAs

Vova Tokarev says:

userfaultfd allows registration on shadow stack VMAs. With userfaultfd

access, you can register on the shadow stack, discard a page ... and

inject a page with chosen return addresses via UFFDIO_COPY.

Update vma_can_userfault() to reject VM_SHADOW_STACK.

While on it, also reject VM_SPECIAL so that if a driver would implement

vm_uffd_ops, it wouldn't be possible to register special VMAs with

userfaultfd.

Since VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude

hugetlb VMAs from the check for VM_SPECIAL.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Ref git.kernel.org/stable/c/0c26202b157f1efc3cd2f26f5c30f59b508a6a5d Ref git.kernel.org/stable/c/165613191ad9d034bf17c00e3a142f9561597ec5 Ref git.kernel.org/stable/c/3c58f641e813c3c71039f8fd4d4e2a3aab713288 Ref git.kernel.org/stable/c/495a28d5a100be1b232633f4c2dcc42ba10b3796 Ref git.kernel.org/stable/c/d974b4b786214883bd8e56bda10b454c80fd6205

Frequently Asked Questions

What is CVE-2026-68166?

CVE-2026-68166 is a known-severity vulnerability. It was published on August 10, 2026.

How severe is CVE-2026-68166?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-68166?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-68166?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-68166 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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