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CVE-2026-64090

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: avoid empty VLAN responses The commit 16116dac2339 ("batman-adv: prevent TT request storms by not sending incon…

Published Jul 19, 2026EPSS 0.13%

Overview

CVE-2026-64090 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

batman-adv: tt: avoid empty VLAN responses

The commit 16116dac2339 ("batman-adv: prevent TT request storms by not

sending inconsistent TT TLVLs") added checks to the local (direct) TT

response code. But the response can also be done indirectly by another node

using the global TT state. To avoid such inconsistency states reported in

the original fix, also avoid sending empty VLANs for replies from the

global TT state.

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/1f467d9a095211d3f77e8ff1bee90e73ffe01c64Refgit.kernel.org/stable/c/99f17d1cdb371cbd037975239b321f346d38f6d2Refgit.kernel.org/stable/c/9a02c8fc963ddeecb5d8788be0740c1869fc54b7Refgit.kernel.org/stable/c/ab26e346322648f5c39de017d9723c9256284fceRefgit.kernel.org/stable/c/b93ca6012712ecab2b551e120d7c95038d6a89e5Refgit.kernel.org/stable/c/cfb30645280a2131e46cbd1b9a38cfd3ff893f12Refgit.kernel.org/stable/c/ea4f757641430bcc8322772e161453c4db5ecb64Refgit.kernel.org/stable/c/fa1bd704940b5bcbc32c0b28db9167405c8ee5e0

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64090?

CVE-2026-64090 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-64090?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64090?

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-2026-64090?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64090 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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