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CVE-2026-89562

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ip6_gre: fix hardware header length for NBMA tunnels ip6gre_tnl_link_config_route() accumulates the lower device's hardware hea…

Published Sep 11, 2026EPSS 0.13%

Overview

CVE-2026-89562 is a high-severity vulnerability. It was published on September 11, 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_gre: fix hardware header length for NBMA tunnels

ip6gre_tnl_link_config_route() accumulates the lower device's hardware

header length into dev->hard_header_len whenever header_ops is set. This

is incorrect for both users of header_ops.

ip6gretap and ip6erspan have a fixed Ethernet hardware header length.

For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header,

the optional FOU or GUE header, and the outer IPv6 header. The lower

device header is headroom needed later, not part of the tunnel device's

hardware header.

Keep the lower device header in needed_headroom. Set hard_header_len to

the tunnel header length only for ARPHRD_IP6GRE devices with header_ops,

and leave the fixed Ethernet header length unchanged for tap and erspan

devices.

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/505b6d296c486ef7d1274f279d4c43a172f63224Refgit.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9Refgit.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6aRefgit.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ffRefgit.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cbRefgit.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16cRefgit.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0Refgit.kernel.org/stable/c/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89562?

CVE-2026-89562 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89562?

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-2026-89562?

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-2026-89562?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89562 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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