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CVE-2026-90309

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or er…

Published Sep 17, 2026EPSS 0.17%

Overview

CVE-2026-90309 is a high-severity vulnerability. It was published on September 17, 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/erdma: Hold CQ references when processing EQ events

EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or

error callbacks outside the xarray lock. erdma_destroy_cq() can erase the

CQ from the xarray and free its queue buffer and doorbell record while a

previously scheduled EQ handler is still using the CQ.

Add a CQ refcount and take a reference under the xarray lock with

refcount_inc_not_zero(). Remove the CQ from the xarray before dropping

the destroy-path reference, then wait for in-flight EQ users before

releasing CQ resources.

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/05b8ca493dd02319bca93c640b259c2ba51ef321Refgit.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cdRefgit.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36Refgit.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8Refgit.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36Refgit.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90309?

CVE-2026-90309 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90309?

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-2026-90309?

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-2026-90309?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90309 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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