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CVE-2026-68419

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent rereg_mr for non-mem regions When a QP/CQ/SRQ is created, a two step process is used where the buffer is al…

Published Aug 10, 2026EPSS 0.13%

Overview

CVE-2026-68419 is a high-severity vulnerability. It was published on August 10, 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:

RDMA/irdma: Prevent rereg_mr for non-mem regions

When a QP/CQ/SRQ is created, a two step process is used

where the buffer is allocated in userspace and explicitly

registered with the normal reg_mr mechanism prior to creating

the actual QP/CQ/SRQ object.

These special registrations are indicated via an ABI field

so the driver knows that they do not have a valid mkey and

to skip the actual CQP command submission.

Since these are real MR objects from the core's perspective,

it is possible for a user application to invoke rereg_mr on them

and cause a real CQP op to be emitted with the zero-initialized

mkey value of 0.

Fix this by preventing rereg_mr on these special regions.

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/a846aecb931b4d65d5eafa92a0623545af46d4f2Refgit.kernel.org/stable/c/b5029e91c63406e4f4c8d58161048b41b6f0bd8cRefgit.kernel.org/stable/c/ca1c29f05274b737dc964e28b97803750d7cf7ecRefgit.kernel.org/stable/c/dbaa37e060918c45517786e37ecab0f300b48fa9Refgit.kernel.org/stable/c/fb46d134e1b8690bed2da9005b36d32d2efd34ac

How CyberStrike helps

Frequently asked questions

What is CVE-2026-68419?

CVE-2026-68419 is a high-severity vulnerability. It was published on August 10, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-68419?

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-2026-68419?

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-2026-68419?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-68419 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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