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CVE-2026-90423

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix UAF in ODP init error-handling path rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before calling rxe_…

Published Sep 17, 2026EPSS 0.17%

Overview

CVE-2026-90423 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/rxe: Fix UAF in ODP init error-handling path

rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before

calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,

rxe_odp_mr_init_user() releases umem_odp and returns an error.

rxe_reg_user_mr() then unwinds the error through rxe_cleanup(),

rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an

IS_ERR_OR_NULL(umem) check at the start of ib_umem_release().

But since mr->umem is NOT reset to NULL in the error handling

path of rxe_odp_mr_init_user(), the check passes and it reads

already-freed fields like umem->is_dmabuf, causing UAF.

Fix the UAF by clearing mr->umem after releasing the failed

ODP umem so the MR cleanup path does not release it again.

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/4cfb448705da3171d44d9cbe7be53ff03284d532Refgit.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732Refgit.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90423?

CVE-2026-90423 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-2026-90423?

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-2026-90423?

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-2026-90423?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90423 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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