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CVE-2026-74663

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/sched: reject overly deep qdisc hierarchies Deep qdisc hierarchies can lead to excessive recursion in qdisc tree walkers an…

Published Aug 22, 2026EPSS 0.13%

Overview

CVE-2026-74663 is a high-severity vulnerability. It was published on August 22, 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:

net/sched: reject overly deep qdisc hierarchies

Deep qdisc hierarchies can lead to excessive recursion in qdisc tree

walkers and exhaust the kernel stack. The existing loop check does not

cover the create-and-graft path, so a hierarchy can still be extended by

creating a new child qdisc below an already deep parent.

Store the hierarchy depth in struct Qdisc and update it when qdiscs are

grafted. Reject new child qdiscs once the parent is already at the maximum

allowed depth.

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/08dc49df1527b09d9ea225a7265bbf6c237097bfRefgit.kernel.org/stable/c/2759acf08a3454866660edcd3ef4e64139f254a6Refgit.kernel.org/stable/c/8ca8cdb74939581339e1ae370193c0adb5a85336Refgit.kernel.org/stable/c/9f69bb9fdaa2fe64b68bb62fb84d405784bee540Refgit.kernel.org/stable/c/a4b14a4df29d36458a943f9b521ddd0f940363ccRefgit.kernel.org/stable/c/a627d36c2a94e18c8c105ae68008786dfd85592eRefgit.kernel.org/stable/c/dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01Refgit.kernel.org/stable/c/e2d658c6427844cee5bc654b436ca68d680b6148

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74663?

CVE-2026-74663 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74663?

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-2026-74663?

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-2026-74663?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74663 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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