Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2026-89476

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sctp: fix stream->outcnt underflow on duplicate RECONF responses A cached RECONF chunk may contain more than one request parame…

Published Sep 11, 2026EPSS 0.70%

Overview

CVE-2026-89476 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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:

sctp: fix stream->outcnt underflow on duplicate RECONF responses

A cached RECONF chunk may contain more than one request parameter. A

duplicate response can therefore find and process the same ADD_OUT request

again while another parameter is still outstanding, rolling back outcnt

twice and possibly underflowing it.

Track outstanding request types as bits and clear each bit after its first

response. Later responses for the same request are then ignored.

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/041f7df5a929d3e7435dd8387e8ea17f2d412b7dRefgit.kernel.org/stable/c/092acd3c55a4077b00489064615d8d2d898daf91Refgit.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19aRefgit.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6eRefgit.kernel.org/stable/c/59f61c39cb99ee1737bd742a20094fe5653389bbRefgit.kernel.org/stable/c/793519e343867ee9a3e84f6cac07f81f2aec7b5dRefgit.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68Refgit.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89476?

CVE-2026-89476 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-89476?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89476?

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-2026-89476?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89476 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.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
Watch the demo →