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CVE-2026-89481

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix host memory disclosure on R2T for a read command nvme_tcp_handle_r2t() does not check the direction of the reques…

Published Sep 11, 2026EPSS 0.43%

Overview

CVE-2026-89481 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:

nvme-tcp: fix host memory disclosure on R2T for a read command

nvme_tcp_handle_r2t() does not check the direction of the request the

R2T refers to. A malicious controller can send an R2T for a READ and

the host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the

H2CData header and nvme_tcp_try_send_data() sends the request's data

buffer. That buffer is the READ destination, so its contents go to the

controller.

The command then completes normally and nothing is logged.

Against a test controller that answers every READ with an R2T, a 4096

byte buffered read returned all 4096 bytes, split over two R2Ts. The

pages contained stale kernel data, including an array of struct page

pointers.

Reject an R2T for a request that is not a write.

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/377aa04d7b3e73ffef6364818def188da8d6f025Refgit.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5Refgit.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25cRefgit.kernel.org/stable/c/49a4dcf57608ebf6432dbcb203ed25e7ed581445Refgit.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8Refgit.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403Refgit.kernel.org/stable/c/bc4013c7cce58d46f792c8c87bc8c8318a70190eRefgit.kernel.org/stable/c/effe898669c5f69ed519d6339be01ee9cd91d1a4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89481?

CVE-2026-89481 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-2026-89481?

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-2026-89481?

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-2026-89481?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89481 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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