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CVE-2026-80681

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hd…

Published Aug 28, 2026EPSS 0.50%

Overview

CVE-2026-80681 is a critical-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

vxlan: re-fetch eth header after route_shortcircuit()

Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).

Inside route_shortcircuit(), pskb_may_pull() can be called, which may

reallocate skb->head.

In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to

freed memory, leading to a use-after-free when dereferencing eth->h_dest.

Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

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/1235e017aa11cf01e91b613c4c5ed6aa28934fffRefgit.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5Refgit.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585Refgit.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5Refgit.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555Refgit.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56Refgit.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4Refgit.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80681?

CVE-2026-80681 is a critical-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-80681?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80681?

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-2026-80681?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80681 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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