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CVE-2026-89743

7.7 · HIGH

In the Linux kernel, the following vulnerability has been resolved: misc: nsm: bound the device-reported response length nsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported b…

Published Sep 11, 2026EPSS 0.14%

Overview

CVE-2026-89743 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

misc: nsm: bound the device-reported response length

nsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported

by the NSM device into msg->resp.len without bounding it to the response

buffer. A malicious or buggy backend can report a length larger than the

response buffer; parse_resp_raw() then copies that many bytes out of the

fixed buffer to user space, disclosing adjacent kernel heap (an

out-of-bounds read). The request path already floors its length in

fill_req_raw(); the response path lacks the symmetric check.

Clamp the stored length to the size of the response buffer. Well-behaved

devices report no more than the posted buffer size, so conforming traffic

is unaffected.

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/29e634a18957acda11383a15ab98a91c4ae9e294Refgit.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adfRefgit.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30Refgit.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89743?

CVE-2026-89743 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-89743?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89743?

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-2026-89743?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89743 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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