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CVE-2026-46181

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees…

Published May 28, 2026CWE-366EPSS 0.11%

Overview

CVE-2026-46181 is a high-severity vulnerability. It was published on May 28, 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/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Sashiko points out the radix_tree itself is RCU safe, but nothing ever

frees the mlx4_srq struct with RCU, and it isn't even accessed within the

RCU critical section. It also will crash if an event is delivered before

the srq object is finished initializing.

Use the spinlock since it isn't easy to make RCU work, use

refcount_inc_not_zero() to protect against partially initialized objects,

and order the refcount_set() to be after the srq is fully initialized.

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/1e2a44875b6afb4add1115f7f3351dcbeb6f273dRefgit.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0Refgit.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0Refaccess.redhat.com/errata/RHSA-2026:25120Refaccess.redhat.com/errata/RHSA-2026:25121Refaccess.redhat.com/errata/RHSA-2026:25217Refaccess.redhat.com/errata/RHSA-2026:33900Refaccess.redhat.com/errata/RHSA-2026:34094Refaccess.redhat.com/errata/RHSA-2026:34095Refaccess.redhat.com/errata/RHSA-2026:34443

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46181?

CVE-2026-46181 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46181?

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-2026-46181?

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-2026-46181?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46181 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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