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CVE-2026-43491

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Limit the maximum server registration per node Current code does no bound checking on the number of servers adde…

Published May 19, 2026EPSS 0.15%

Overview

CVE-2026-43491 is a medium-severity vulnerability. It was published on May 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:

net: qrtr: ns: Limit the maximum server registration per node

Current code does no bound checking on the number of servers added per

node. A malicious client can flood NEW_SERVER messages and exhaust memory.

Fix this issue by limiting the maximum number of server registrations to

256 per node. If the NEW_SERVER message is received for an old port, then

don't restrict it as it will get replaced. While at it, also rate limit

the error messages in the failure path of qrtr_ns_worker().

Note that the limit of 256 is chosen based on the current platform

requirements. If requirement changes in the future, this limit can be

increased.

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/35fb4a0c077c5d1049c2628b769e0a1b1e65df0dRefgit.kernel.org/stable/c/3efaad55cad1ded429e3a873bfece389058a526bRefgit.kernel.org/stable/c/868202aa2adae427060a42d5bd663b4d782ec02cRefgit.kernel.org/stable/c/94914731ca0b99899dceadd80d2df00584a688caRefgit.kernel.org/stable/c/991c431077b19176d3fe3bb54054c063776a8cdcRefgit.kernel.org/stable/c/b48fc702b20233b809f01053232c3cd5083c97b4Refgit.kernel.org/stable/c/d5ee2ff98322337951c56398e79d51815acbf955Refgit.kernel.org/stable/c/e6f6cd501fb54060940a6eb3f4103eeb5e426ae7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43491?

CVE-2026-43491 is a medium-severity vulnerability. It was published on May 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43491?

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-2026-43491?

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-2026-43491?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43491 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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