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CVE-2026-52909

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device.

Published Jun 19, 2026EPSS 0.12%

Overview

CVE-2026-52909 is a high-severity vulnerability. It was published on June 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

ip6_vti: set netns_immutable on the fallback device.

john1988 and Noam Rathaus reported that vti6_init_net() does not set the

netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0).

Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel)

correctly set this flag during their fallback device initialization to

prevent them from being moved to another network namespace.

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

Refgit.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7ccRefgit.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01Refgit.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41Refgit.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305Refgit.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9Refgit.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3Refgit.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885Refgit.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52909?

CVE-2026-52909 is a high-severity vulnerability. It was published on June 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-52909?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52909?

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-2026-52909?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52909 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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